CVE-2026-21510 (GCVE-0-2026-21510)

Vulnerability from cvelistv5 – Published: 2026-02-10 17:51 – Updated: 2026-08-19 16:26
VLAI CISA Previdian
Title
Windows Shell Security Feature Bypass Vulnerability
Summary
Protection mechanism failure in Windows Shell allows an unauthorized attacker to bypass a security feature over a network.
Severity
8.8 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C
SSVC
Exploitation: active Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-02-11 04:56 UTC
CWE
  • CWE-693 - Protection Mechanism Failure
Assigner
References
Impacted products
Vendor Product Version
Microsoft Windows 10 Version 1607 Affected: 10.0.14393.0 , < 10.0.14393.8868 (custom)
Create a notification for this product.
Microsoft Windows 10 Version 1809 Affected: 10.0.17763.0 , < 10.0.17763.8389 (custom)
Create a notification for this product.
Microsoft Windows 10 Version 21H2 Affected: 10.0.19044.0 , < 10.0.19044.6937 (custom)
Create a notification for this product.
Microsoft Windows 10 Version 22H2 Affected: 10.0.19045.0 , < 10.0.19045.6937 (custom)
Create a notification for this product.
Microsoft Windows 11 version 22H3 Affected: 10.0.22631.0 , < 10.0.22631.6649 (custom)
Create a notification for this product.
Microsoft Windows 11 Version 23H2 Affected: 10.0.22631.0 , < 10.0.22631.6649 (custom)
Create a notification for this product.
Microsoft Windows 11 Version 24H2 Affected: 10.0.26100.0 , < 10.0.26100.7840 (custom)
Create a notification for this product.
Microsoft Windows 11 Version 25H2 Affected: 10.0.26200.0 , < 10.0.26200.7840 (custom)
Create a notification for this product.
Microsoft Windows 11 version 26H1 Affected: 10.0.28000.0 , < 10.0.28000.1575 (custom)
Create a notification for this product.
Microsoft Windows 11 Version 26H1 Affected: 10.0.28000.0 , < 10.0.28000.1575 (custom)
Create a notification for this product.
Microsoft Windows Server 2012 Affected: 6.2.9200.0 , < 6.2.9200.25923 (custom)
Create a notification for this product.
Microsoft Windows Server 2012 (Server Core installation) Affected: 6.2.9200.0 , < 6.2.9200.25923 (custom)
Create a notification for this product.
Microsoft Windows Server 2012 R2 Affected: 6.3.9600.0 , < 6.3.9600.23022 (custom)
Create a notification for this product.
Microsoft Windows Server 2012 R2 (Server Core installation) Affected: 6.3.9600.0 , < 6.3.9600.23022 (custom)
Create a notification for this product.
Microsoft Windows Server 2016 Affected: 10.0.14393.0 , < 10.0.14393.8868 (custom)
Create a notification for this product.
Microsoft Windows Server 2016 (Server Core installation) Affected: 10.0.14393.0 , < 10.0.14393.8868 (custom)
Create a notification for this product.
Microsoft Windows Server 2019 Affected: 10.0.17763.0 , < 10.0.17763.8389 (custom)
Create a notification for this product.
Microsoft Windows Server 2019 (Server Core installation) Affected: 10.0.17763.0 , < 10.0.17763.8389 (custom)
Create a notification for this product.
Microsoft Windows Server 2022 Affected: 10.0.20348.0 , < 10.0.20348.4773 (custom)
Create a notification for this product.
Microsoft Windows Server 2022, 23H2 Edition (Server Core installation) Affected: 10.0.25398.0 , < 10.0.25398.2149 (custom)
Create a notification for this product.
Microsoft Windows Server 2025 Affected: 10.0.26100.0 , < 10.0.26100.32370 (custom)
Create a notification for this product.
Microsoft Windows Server 2025 (Server Core installation) Affected: 10.0.26100.0 , < 10.0.26100.32370 (custom)
Create a notification for this product.
Date Public
2026-02-10 16:00
CISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: beeaf4f5-2a8f-4449-8bbe-0024488dd416

Vulnerability ID: CVE-2026-21510

Status: Confirmed

Status Updated: 2026-02-10 01:00 CET

Exploited: Yes

Timestamps
First Seen: 2026-02-10
Asserted: 2026-02-10
Scope
Notes: Microsoft Windows Shell Protection Mechanism Failure Vulnerability | Affected: Microsoft / Windows | Description: Microsoft Windows Shell contains a protection mechanism failure vulnerability that could allow an unauthorized attacker to bypass a security feature over a network. | Required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. | Due date: 2026-03-03 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21510 ; https://nvd.nist.gov/vuln/detail/CVE-2026-21510
Evidence

Type: Vendor Report

Signal: Successful Exploitation

Confidence: 80%

Source: cisa-kev

Details
Cwes CWE-693
Feed CISA Known Exploited Vulnerabilities Catalog
Product Windows
Due Date 2026-03-03
Date Added 2026-02-10
Vendorproject Microsoft
Vulnerabilityname Microsoft Windows Shell Protection Mechanism Failure Vulnerability
Knownransomwarecampaignuse Unknown
References
Created: 2026-10-02 08:09 CEST | Updated: 2026-10-02 08:09 CEST
Previdian
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: f948355d-1d39-42f8-8cbd-4f3f85f4d577

Vulnerability ID: CVE-2026-21510

Status: Confirmed

Status Updated: 2026-06-01 12:50 CEST

Exploited: Yes

Timestamps
First Seen: 2026-06-01
Asserted: 2026-06-01
Scope
Notes: Windows Shell Security Feature Bypass Vulnerability | Affected: Microsoft / Windows 10 Version 1607, Windows 10 Version 1809, Windows 10 Version 21H2, Windows 10 Version 22H2, Windows 11 version 22H3, Windows 11 Version 23H2, Windows 11 Version 24H2, Windows 11 Version 25H2, Windows 11 version 26H1, Windows 11 Version 26H1, Windows Server 2012, Windows Server 2012 (Server Core installation), Windows Server 2012 R2, Windows Server 2012 R2 (Server Core installation), Windows Server 2016, Windows Server 2016 (Server Core installation), Windows Server 2019, Windows Server 2019 (Server Core installation), Windows Server 2022, Windows Server 2022, 23H2 Edition (Server Core installation), Windows Server 2025, Windows Server 2025 (Server Core installation) | CVSS: 8.8 (HIGH) | EPSS: 0.24226 | Used in malware: unknown | Listed 1 day ahead of CISA KEV | Not yet in CISA KEV: False
Evidence

Type: Public Report

Signal: Successful Exploitation

Confidence: 70%

Source: previdian

Details
Feed Previdian (previdian.com)
Title Windows Shell Security Feature Bypass Vulnerability
Cve Id CVE-2026-21510
Vendor Microsoft
Ghsa Id None
Product Windows 10 Version 1607, Windows 10 Version 1809, Windows 10 Version 21H2, Windows 10 Version 22H2, Windows 11 version 22H3, Windows 11 Version 23H2, Windows 11 Version 24H2, Windows 11 Version 25H2, Windows 11 version 26H1, Windows 11 Version 26H1, Windows Server 2012, Windows Server 2012 (Server Core installation), Windows Server 2012 R2, Windows Server 2012 R2 (Server Core installation), Windows Server 2016, Windows Server 2016 (Server Core installation), Windows Server 2019, Windows Server 2019 (Server Core installation), Windows Server 2022, Windows Server 2022, 23H2 Edition (Server Core installation), Windows Server 2025, Windows Server 2025 (Server Core installation)
Added Date 2026-06-01T10:50:47.605Z
Cvss Score 8.8
Epss Score 0.24226
Previous Ids
Cvss Severity HIGH
Virtual Patch False
Cvss Estimated False
Epss Percentile 0.97791
Used In Malware unknown
Vulnerability Id CVE-2026-21510
Ahead Of Cisa Kev 
{
  "count": 1,
  "unit": "day"
}
Not Yet In Cisa Kev False
References
Created: 2026-10-02 09:09 CEST | Updated: 2026-10-02 09:09 CEST
Show details on NVD website
To clipboard 

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-21510",
                "options": [
                  {
                    "Exploitation": "active"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-02-11T04:56:00.277068Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          },
          {
            "other": {
              "content": {
                "dateAdded": "2026-02-10",
                "reference": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-21510"
              },
              "type": "kev"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-02-26T14:44:45.894Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "references": [
          {
            "tags": [
              "government-resource"
            ],
            "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-21510"
          }
        ],
        "timeline": [
          {
            "lang": "en",
            "time": "2026-02-10T00:00:00.000Z",
            "value": "CVE-2026-21510 added to CISA KEV"
          }
        ],
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "platforms": [
            "32-bit Systems",
            "x64-based Systems"
          ],
          "product": "Windows 10 Version 1607",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "10.0.14393.8868",
              "status": "affected",
              "version": "10.0.14393.0",
              "versionType": "custom"
            }
          ]
        },
        {
          "platforms": [
            "32-bit Systems",
            "x64-based Systems"
          ],
          "product": "Windows 10 Version 1809",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "10.0.17763.8389",
              "status": "affected",
              "version": "10.0.17763.0",
              "versionType": "custom"
            }
          ]
        },
        {
          "platforms": [
            "32-bit Systems",
            "ARM64-based Systems",
            "x64-based Systems"
          ],
          "product": "Windows 10 Version 21H2",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "10.0.19044.6937",
              "status": "affected",
              "version": "10.0.19044.0",
              "versionType": "custom"
            }
          ]
        },
        {
          "platforms": [
            "32-bit Systems",
            "ARM64-based Systems",
            "x64-based Systems"
          ],
          "product": "Windows 10 Version 22H2",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "10.0.19045.6937",
              "status": "affected",
              "version": "10.0.19045.0",
              "versionType": "custom"
            }
          ]
        },
        {
          "platforms": [
            "ARM64-based Systems"
          ],
          "product": "Windows 11 version 22H3",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "10.0.22631.6649",
              "status": "affected",
              "version": "10.0.22631.0",
              "versionType": "custom"
            }
          ]
        },
        {
          "platforms": [
            "x64-based Systems"
          ],
          "product": "Windows 11 Version 23H2",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "10.0.22631.6649",
              "status": "affected",
              "version": "10.0.22631.0",
              "versionType": "custom"
            }
          ]
        },
        {
          "platforms": [
            "ARM64-based Systems",
            "x64-based Systems"
          ],
          "product": "Windows 11 Version 24H2",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "10.0.26100.7840",
              "status": "affected",
              "version": "10.0.26100.0",
              "versionType": "custom"
            }
          ]
        },
        {
          "product": "Windows 11 Version 25H2",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "10.0.26200.7840",
              "status": "affected",
              "version": "10.0.26200.0",
              "versionType": "custom"
            }
          ]
        },
        {
          "platforms": [
            "ARM64-based Systems"
          ],
          "product": "Windows 11 version 26H1",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "10.0.28000.1575",
              "status": "affected",
              "version": "10.0.28000.0",
              "versionType": "custom"
            }
          ]
        },
        {
          "product": "Windows 11 Version 26H1",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "10.0.28000.1575",
              "status": "affected",
              "version": "10.0.28000.0",
              "versionType": "custom"
            }
          ]
        },
        {
          "platforms": [
            "x64-based Systems"
          ],
          "product": "Windows Server 2012",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "6.2.9200.25923",
              "status": "affected",
              "version": "6.2.9200.0",
              "versionType": "custom"
            }
          ]
        },
        {
          "platforms": [
            "x64-based Systems"
          ],
          "product": "Windows Server 2012 (Server Core installation)",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "6.2.9200.25923",
              "status": "affected",
              "version": "6.2.9200.0",
              "versionType": "custom"
            }
          ]
        },
        {
          "platforms": [
            "x64-based Systems"
          ],
          "product": "Windows Server 2012 R2",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "6.3.9600.23022",
              "status": "affected",
              "version": "6.3.9600.0",
              "versionType": "custom"
            }
          ]
        },
        {
          "platforms": [
            "x64-based Systems"
          ],
          "product": "Windows Server 2012 R2 (Server Core installation)",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "6.3.9600.23022",
              "status": "affected",
              "version": "6.3.9600.0",
              "versionType": "custom"
            }
          ]
        },
        {
          "platforms": [
            "x64-based Systems"
          ],
          "product": "Windows Server 2016",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "10.0.14393.8868",
              "status": "affected",
              "version": "10.0.14393.0",
              "versionType": "custom"
            }
          ]
        },
        {
          "platforms": [
            "x64-based Systems"
          ],
          "product": "Windows Server 2016 (Server Core installation)",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "10.0.14393.8868",
              "status": "affected",
              "version": "10.0.14393.0",
              "versionType": "custom"
            }
          ]
        },
        {
          "platforms": [
            "x64-based Systems"
          ],
          "product": "Windows Server 2019",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "10.0.17763.8389",
              "status": "affected",
              "version": "10.0.17763.0",
              "versionType": "custom"
            }
          ]
        },
        {
          "platforms": [
            "x64-based Systems"
          ],
          "product": "Windows Server 2019 (Server Core installation)",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "10.0.17763.8389",
              "status": "affected",
              "version": "10.0.17763.0",
              "versionType": "custom"
            }
          ]
        },
        {
          "platforms": [
            "x64-based Systems"
          ],
          "product": "Windows Server 2022",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "10.0.20348.4773",
              "status": "affected",
              "version": "10.0.20348.0",
              "versionType": "custom"
            }
          ]
        },
        {
          "platforms": [
            "x64-based Systems"
          ],
          "product": "Windows Server 2022, 23H2 Edition (Server Core installation)",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "10.0.25398.2149",
              "status": "affected",
              "version": "10.0.25398.0",
              "versionType": "custom"
            }
          ]
        },
        {
          "platforms": [
            "x64-based Systems"
          ],
          "product": "Windows Server 2025",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "10.0.26100.32370",
              "status": "affected",
              "version": "10.0.26100.0",
              "versionType": "custom"
            }
          ]
        },
        {
          "platforms": [
            "x64-based Systems"
          ],
          "product": "Windows Server 2025 (Server Core installation)",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "10.0.26100.32370",
              "status": "affected",
              "version": "10.0.26100.0",
              "versionType": "custom"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x86:*",
                  "versionEndExcluding": "10.0.17763.8389",
                  "versionStartIncluding": "10.0.17763.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "10.0.17763.8389",
                  "versionStartIncluding": "10.0.17763.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "10.0.17763.8389",
                  "versionStartIncluding": "10.0.17763.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "10.0.20348.4773",
                  "versionStartIncluding": "10.0.20348.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:microsoft:windows_10_21H2:*:*:*:*:*:*:x86:*",
                  "versionEndExcluding": "10.0.19044.6937",
                  "versionStartIncluding": "10.0.19044.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:microsoft:windows_10_22H2:*:*:*:*:*:*:x64:*",
                  "versionEndExcluding": "10.0.19045.6937",
                  "versionStartIncluding": "10.0.19045.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "10.0.26100.32370",
                  "versionStartIncluding": "10.0.26100.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:microsoft:windows_11_25H2:*:*:*:*:*:*:arm64:*",
                  "versionEndExcluding": "10.0.26200.7840",
                  "versionStartIncluding": "10.0.26200.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:microsoft:windows_11_23H2:*:*:*:*:*:*:arm64:*",
                  "versionEndExcluding": "10.0.22631.6649",
                  "versionStartIncluding": "10.0.22631.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:microsoft:windows_11_23H2:*:*:*:*:*:*:x64:*",
                  "versionEndExcluding": "10.0.22631.6649",
                  "versionStartIncluding": "10.0.22631.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:microsoft:windows_server_23h2:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "10.0.25398.2149",
                  "versionStartIncluding": "10.0.25398.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:microsoft:windows_11_24H2:*:*:*:*:*:*:arm64:*",
                  "versionEndExcluding": "10.0.26100.7840",
                  "versionStartIncluding": "10.0.26100.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "10.0.26100.32370",
                  "versionStartIncluding": "10.0.26100.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x86:*",
                  "versionEndExcluding": "10.0.14393.8868",
                  "versionStartIncluding": "10.0.14393.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:microsoft:windows_server_2016:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "10.0.14393.8868",
                  "versionStartIncluding": "10.0.14393.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:microsoft:windows_server_2016:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "10.0.14393.8868",
                  "versionStartIncluding": "10.0.14393.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:microsoft:windows_server_2012:*:*:*:*:*:*:x64:*",
                  "versionEndExcluding": "6.2.9200.25923",
                  "versionStartIncluding": "6.2.9200.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:microsoft:windows_server_2012:*:*:*:*:*:*:x64:*",
                  "versionEndExcluding": "6.2.9200.25923",
                  "versionStartIncluding": "6.2.9200.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:microsoft:windows_server_2012_R2:*:*:*:*:*:*:x64:*",
                  "versionEndExcluding": "6.3.9600.23022",
                  "versionStartIncluding": "6.3.9600.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:microsoft:windows_server_2012_R2:*:*:*:*:*:*:x64:*",
                  "versionEndExcluding": "6.3.9600.23022",
                  "versionStartIncluding": "6.3.9600.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:microsoft:windows_11_26H1:*:*:*:*:*:*:arm64:*",
                  "versionEndExcluding": "10.0.28000.1575",
                  "versionStartIncluding": "10.0.28000.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:microsoft:windows_11_26H1:*:*:*:*:*:*:x64:*",
                  "versionEndExcluding": "10.0.28000.1575",
                  "versionStartIncluding": "10.0.28000.0",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "datePublic": "2026-02-10T16:00:00.000Z",
      "descriptions": [
        {
          "lang": "en-US",
          "value": "Protection mechanism failure in Windows Shell allows an unauthorized attacker to bypass a security feature over a network."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C",
            "version": "3.1"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en-US",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-693",
              "description": "CWE-693: Protection Mechanism Failure",
              "lang": "en-US",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-19T16:26:02.555Z",
        "orgId": "f38d906d-7342-40ea-92c1-6c4a2c6478c8",
        "shortName": "microsoft"
      },
      "references": [
        {
          "name": "Windows Shell Security Feature Bypass Vulnerability",
          "tags": [
            "vendor-advisory",
            "patch"
          ],
          "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21510"
        }
      ],
      "title": "Windows Shell Security Feature Bypass Vulnerability"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "f38d906d-7342-40ea-92c1-6c4a2c6478c8",
    "assignerShortName": "microsoft",
    "cveId": "CVE-2026-21510",
    "datePublished": "2026-02-10T17:51:32.210Z",
    "dateReserved": "2025-12-30T18:10:54.845Z",
    "dateUpdated": "2026-08-19T16:26:02.555Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-21510",
      "date": "2026-10-03",
      "epss": "0.24226",
      "percentile": "0.97795"
    },
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "platforms": [
                  "32-bit Systems",
                  "x64-based Systems"
                ],
                "product": "Windows 10 Version 1607",
                "vendor": "Microsoft",
                "versions": [
                  {
                    "lessThan": "10.0.14393.8868",
                    "status": "affected",
                    "version": "10.0.14393.0",
                    "versionType": "custom"
                  }
                ]
              },
              {
                "platforms": [
                  "32-bit Systems",
                  "x64-based Systems"
                ],
                "product": "Windows 10 Version 1809",
                "vendor": "Microsoft",
                "versions": [
                  {
                    "lessThan": "10.0.17763.8389",
                    "status": "affected",
                    "version": "10.0.17763.0",
                    "versionType": "custom"
                  }
                ]
              },
              {
                "platforms": [
                  "32-bit Systems",
                  "ARM64-based Systems",
                  "x64-based Systems"
                ],
                "product": "Windows 10 Version 21H2",
                "vendor": "Microsoft",
                "versions": [
                  {
                    "lessThan": "10.0.19044.6937",
                    "status": "affected",
                    "version": "10.0.19044.0",
                    "versionType": "custom"
                  }
                ]
              },
              {
                "platforms": [
                  "32-bit Systems",
                  "ARM64-based Systems",
                  "x64-based Systems"
                ],
                "product": "Windows 10 Version 22H2",
                "vendor": "Microsoft",
                "versions": [
                  {
                    "lessThan": "10.0.19045.6937",
                    "status": "affected",
                    "version": "10.0.19045.0",
                    "versionType": "custom"
                  }
                ]
              },
              {
                "platforms": [
                  "ARM64-based Systems"
                ],
                "product": "Windows 11 version 22H3",
                "vendor": "Microsoft",
                "versions": [
                  {
                    "lessThan": "10.0.22631.6649",
                    "status": "affected",
                    "version": "10.0.22631.0",
                    "versionType": "custom"
                  }
                ]
              },
              {
                "platforms": [
                  "x64-based Systems"
                ],
                "product": "Windows 11 Version 23H2",
                "vendor": "Microsoft",
                "versions": [
                  {
                    "lessThan": "10.0.22631.6649",
                    "status": "affected",
                    "version": "10.0.22631.0",
                    "versionType": "custom"
                  }
                ]
              },
              {
                "platforms": [
                  "ARM64-based Systems",
                  "x64-based Systems"
                ],
                "product": "Windows 11 Version 24H2",
                "vendor": "Microsoft",
                "versions": [
                  {
                    "lessThan": "10.0.26100.7840",
                    "status": "affected",
                    "version": "10.0.26100.0",
                    "versionType": "custom"
                  }
                ]
              },
              {
                "product": "Windows 11 Version 25H2",
                "vendor": "Microsoft",
                "versions": [
                  {
                    "lessThan": "10.0.26200.7840",
                    "status": "affected",
                    "version": "10.0.26200.0",
                    "versionType": "custom"
                  }
                ]
              },
              {
                "platforms": [
                  "ARM64-based Systems"
                ],
                "product": "Windows 11 version 26H1",
                "vendor": "Microsoft",
                "versions": [
                  {
                    "lessThan": "10.0.28000.1575",
                    "status": "affected",
                    "version": "10.0.28000.0",
                    "versionType": "custom"
                  }
                ]
              },
              {
                "product": "Windows 11 Version 26H1",
                "vendor": "Microsoft",
                "versions": [
                  {
                    "lessThan": "10.0.28000.1575",
                    "status": "affected",
                    "version": "10.0.28000.0",
                    "versionType": "custom"
                  }
                ]
              },
              {
                "platforms": [
                  "x64-based Systems"
                ],
                "product": "Windows Server 2012",
                "vendor": "Microsoft",
                "versions": [
                  {
                    "lessThan": "6.2.9200.25923",
                    "status": "affected",
                    "version": "6.2.9200.0",
                    "versionType": "custom"
                  }
                ]
              },
              {
                "platforms": [
                  "x64-based Systems"
                ],
                "product": "Windows Server 2012 (Server Core installation)",
                "vendor": "Microsoft",
                "versions": [
                  {
                    "lessThan": "6.2.9200.25923",
                    "status": "affected",
                    "version": "6.2.9200.0",
                    "versionType": "custom"
                  }
                ]
              },
              {
                "platforms": [
                  "x64-based Systems"
                ],
                "product": "Windows Server 2012 R2",
                "vendor": "Microsoft",
                "versions": [
                  {
                    "lessThan": "6.3.9600.23022",
                    "status": "affected",
                    "version": "6.3.9600.0",
                    "versionType": "custom"
                  }
                ]
              },
              {
                "platforms": [
                  "x64-based Systems"
                ],
                "product": "Windows Server 2012 R2 (Server Core installation)",
                "vendor": "Microsoft",
                "versions": [
                  {
                    "lessThan": "6.3.9600.23022",
                    "status": "affected",
                    "version": "6.3.9600.0",
                    "versionType": "custom"
                  }
                ]
              },
              {
                "platforms": [
                  "x64-based Systems"
                ],
                "product": "Windows Server 2016",
                "vendor": "Microsoft",
                "versions": [
                  {
                    "lessThan": "10.0.14393.8868",
                    "status": "affected",
                    "version": "10.0.14393.0",
                    "versionType": "custom"
                  }
                ]
              },
              {
                "platforms": [
                  "x64-based Systems"
                ],
                "product": "Windows Server 2016 (Server Core installation)",
                "vendor": "Microsoft",
                "versions": [
                  {
                    "lessThan": "10.0.14393.8868",
                    "status": "affected",
                    "version": "10.0.14393.0",
                    "versionType": "custom"
                  }
                ]
              },
              {
                "platforms": [
                  "x64-based Systems"
                ],
                "product": "Windows Server 2019",
                "vendor": "Microsoft",
                "versions": [
                  {
                    "lessThan": "10.0.17763.8389",
                    "status": "affected",
                    "version": "10.0.17763.0",
                    "versionType": "custom"
                  }
                ]
              },
              {
                "platforms": [
                  "x64-based Systems"
                ],
                "product": "Windows Server 2019 (Server Core installation)",
                "vendor": "Microsoft",
                "versions": [
                  {
                    "lessThan": "10.0.17763.8389",
                    "status": "affected",
                    "version": "10.0.17763.0",
                    "versionType": "custom"
                  }
                ]
              },
              {
                "platforms": [
                  "x64-based Systems"
                ],
                "product": "Windows Server 2022",
                "vendor": "Microsoft",
                "versions": [
                  {
                    "lessThan": "10.0.20348.4773",
                    "status": "affected",
                    "version": "10.0.20348.0",
                    "versionType": "custom"
                  }
                ]
              },
              {
                "platforms": [
                  "x64-based Systems"
                ],
                "product": "Windows Server 2022, 23H2 Edition (Server Core installation)",
                "vendor": "Microsoft",
                "versions": [
                  {
                    "lessThan": "10.0.25398.2149",
                    "status": "affected",
                    "version": "10.0.25398.0",
                    "versionType": "custom"
                  }
                ]
              },
              {
                "platforms": [
                  "x64-based Systems"
                ],
                "product": "Windows Server 2025",
                "vendor": "Microsoft",
                "versions": [
                  {
                    "lessThan": "10.0.26100.32370",
                    "status": "affected",
                    "version": "10.0.26100.0",
                    "versionType": "custom"
                  }
                ]
              },
              {
                "platforms": [
                  "x64-based Systems"
                ],
                "product": "Windows Server 2025 (Server Core installation)",
                "vendor": "Microsoft",
                "versions": [
                  {
                    "lessThan": "10.0.26100.32370",
                    "status": "affected",
                    "version": "10.0.26100.0",
                    "versionType": "custom"
                  }
                ]
              }
            ],
            "source": "secure@microsoft.com"
          }
        ],
        "cisaActionDue": "2026-03-03",
        "cisaExploitAdd": "2026-02-10",
        "cisaRequiredAction": "Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.",
        "cisaVulnerabilityName": "Microsoft Windows Shell Protection Mechanism Failure Vulnerability",
        "configurations": [
          {
            "nodes": [
              {
                "cpeMatch": [
                  {
                    "criteria": "cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x64:*",
                    "matchCriteriaId": "E78A20FD-B910-43DF-BE89-E971E2FD0049",
                    "versionEndExcluding": "10.0.14393.8868",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x86:*",
                    "matchCriteriaId": "B941280B-97F6-4F60-80A3-40482A74488D",
                    "versionEndExcluding": "10.0.14393.8868",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x64:*",
                    "matchCriteriaId": "C09C54DA-6AB0-4696-A2F2-C11CFC292EA9",
                    "versionEndExcluding": "10.0.17763.8389",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x86:*",
                    "matchCriteriaId": "369B4E41-3895-4CB7-BD37-D2E4A4D52FB9",
                    "versionEndExcluding": "10.0.17763.8389",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:arm64:*",
                    "matchCriteriaId": "EDB3FD9A-2786-4EC1-8989-2B0D054E0307",
                    "versionEndExcluding": "10.0.19044.6937",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:x64:*",
                    "matchCriteriaId": "893DBA65-116B-4AE0-80E1-50458CB5FDAD",
                    "versionEndExcluding": "10.0.19044.6937",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:x86:*",
                    "matchCriteriaId": "37E2BFF1-28C0-4FA0-9A6C-020146E4AD54",
                    "versionEndExcluding": "10.0.19044.6937",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:arm64:*",
                    "matchCriteriaId": "3ABF7E9C-769A-4330-AD97-FE3CD766E577",
                    "versionEndExcluding": "10.0.19045.6937",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:x64:*",
                    "matchCriteriaId": "F54B0C64-9A1F-470B-9824-322CF362507F",
                    "versionEndExcluding": "10.0.19045.6937",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:x86:*",
                    "matchCriteriaId": "A5BD3F0C-1E6F-4937-806C-B87CA19C2830",
                    "versionEndExcluding": "10.0.19045.6937",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:microsoft:windows_11_23h2:*:*:*:*:*:*:arm64:*",
                    "matchCriteriaId": "B273EF5A-3157-4842-AE91-CEC289813902",
                    "versionEndExcluding": "10.0.22631.6649",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:microsoft:windows_11_23h2:*:*:*:*:*:*:x64:*",
                    "matchCriteriaId": "CD2513FC-D399-4DBF-921F-13B4D1497127",
                    "versionEndExcluding": "10.0.22631.6649",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:arm64:*",
                    "matchCriteriaId": "B08450A0-0F7E-4A05-8989-900221992766",
                    "versionEndExcluding": "10.0.26100.7781",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:x64:*",
                    "matchCriteriaId": "9D30B348-DAE7-43EC-85FA-38E1715258A9",
                    "versionEndExcluding": "10.0.26100.7781",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:microsoft:windows_11_25h2:*:*:*:*:*:*:arm64:*",
                    "matchCriteriaId": "8F23FFCF-9C69-4D27-AF21-D09A6041AA3A",
                    "versionEndExcluding": "10.0.26200.7781",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:microsoft:windows_11_25h2:*:*:*:*:*:*:x64:*",
                    "matchCriteriaId": "D1D93202-BDDB-438F-934E-1FE904B3651B",
                    "versionEndExcluding": "10.0.26200.7781",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:microsoft:windows_server_2012:-:*:*:*:*:*:*:*",
                    "matchCriteriaId": "A7DF96F8-BA6A-4780-9CA3-F719B3F81074",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:microsoft:windows_server_2012:r2:*:*:*:*:*:*:*",
                    "matchCriteriaId": "DB18C4CE-5917-401E-ACF7-2747084FD36E",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:microsoft:windows_server_2016:*:*:*:*:*:*:*:*",
                    "matchCriteriaId": "E21BC97D-1C11-41FD-9A20-34A2BC535BD9",
                    "versionEndExcluding": "10.0.14393.8868",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:*:*",
                    "matchCriteriaId": "B6E3E93E-8160-4BFB-B5CB-85740922CF7E",
                    "versionEndExcluding": "10.0.17763.8389",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:*:*",
                    "matchCriteriaId": "9E19FC4B-C3CC-4924-9A0B-5E4F100280D4",
                    "versionEndExcluding": "10.0.20348.4711",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:microsoft:windows_server_2022_23h2:*:*:*:*:*:*:*:*",
                    "matchCriteriaId": "F0EA3C51-C3FE-494A-92D9-D3B1C301CB54",
                    "versionEndExcluding": "10.0.25398.2149",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:*:*",
                    "matchCriteriaId": "33AF95F4-504F-40EF-9F64-5D6F7B40114F",
                    "versionEndExcluding": "10.0.26100.32313",
                    "vulnerable": true
                  }
                ],
                "negate": false,
                "operator": "OR"
              }
            ]
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "Protection mechanism failure in Windows Shell allows an unauthorized attacker to bypass a security feature over a network."
          },
          {
            "lang": "es",
            "value": "Fallo del mecanismo de protecci\u00f3n en Windows Shell permite a un atacante no autorizado eludir una caracter\u00edstica de seguridad a trav\u00e9s de una red."
          }
        ],
        "id": "CVE-2026-21510",
        "lastModified": "2026-06-17T10:18:45.110",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "NETWORK",
                "availabilityImpact": "HIGH",
                "baseScore": 8.8,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "REQUIRED",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 2.8,
              "impactScore": 5.9,
              "source": "secure@microsoft.com",
              "type": "Secondary"
            }
          ],
          "ssvcV203": [
            {
              "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "ssvcData": {
                "id": "CVE-2026-21510",
                "options": [
                  {
                    "exploitation": "active"
                  },
                  {
                    "automatable": "no"
                  },
                  {
                    "technicalImpact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-02-11T04:56:00.277068Z",
                "version": "2.0.3"
              }
            }
          ]
        },
        "published": "2026-02-10T18:16:33.170",
        "references": [
          {
            "source": "secure@microsoft.com",
            "tags": [
              "Vendor Advisory"
            ],
            "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21510"
          },
          {
            "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
            "tags": [
              "US Government Resource"
            ],
            "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-21510"
          }
        ],
        "sourceIdentifier": "secure@microsoft.com",
        "vulnStatus": "Analyzed",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-693"
              }
            ],
            "source": "secure@microsoft.com",
            "type": "Secondary"
          }
        ]
      }
    },
    "vulnrichment": {
      "containers": {
        "adp": [
          {
            "metrics": [
              {
                "other": {
                  "content": {
                    "id": "CVE-2026-21510",
                    "options": [
                      {
                        "Exploitation": "active"
                      },
                      {
                        "Automatable": "no"
                      },
                      {
                        "Technical Impact": "total"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2026-02-11T04:56:00.277068Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
                }
              },
              {
                "other": {
                  "content": {
                    "dateAdded": "2026-02-10",
                    "reference": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-21510"
                  },
                  "type": "kev"
                }
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2026-02-10T18:26:34.670Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "references": [
              {
                "tags": [
                  "government-resource"
                ],
                "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-21510"
              }
            ],
            "timeline": [
              {
                "lang": "en",
                "time": "2026-02-10T00:00:00.000Z",
                "value": "CVE-2026-21510 added to CISA KEV"
              }
            ],
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
          "affected": [
            {
              "platforms": [
                "32-bit Systems",
                "x64-based Systems"
              ],
              "product": "Windows 10 Version 1607",
              "vendor": "Microsoft",
              "versions": [
                {
                  "lessThan": "10.0.14393.8868",
                  "status": "affected",
                  "version": "10.0.14393.0",
                  "versionType": "custom"
                }
              ]
            },
            {
              "platforms": [
                "32-bit Systems",
                "x64-based Systems"
              ],
              "product": "Windows 10 Version 1809",
              "vendor": "Microsoft",
              "versions": [
                {
                  "lessThan": "10.0.17763.8389",
                  "status": "affected",
                  "version": "10.0.17763.0",
                  "versionType": "custom"
                }
              ]
            },
            {
              "platforms": [
                "32-bit Systems",
                "ARM64-based Systems",
                "x64-based Systems"
              ],
              "product": "Windows 10 Version 21H2",
              "vendor": "Microsoft",
              "versions": [
                {
                  "lessThan": "10.0.19044.6937",
                  "status": "affected",
                  "version": "10.0.19044.0",
                  "versionType": "custom"
                }
              ]
            },
            {
              "platforms": [
                "32-bit Systems",
                "ARM64-based Systems",
                "x64-based Systems"
              ],
              "product": "Windows 10 Version 22H2",
              "vendor": "Microsoft",
              "versions": [
                {
                  "lessThan": "10.0.19045.6937",
                  "status": "affected",
                  "version": "10.0.19045.0",
                  "versionType": "custom"
                }
              ]
            },
            {
              "platforms": [
                "ARM64-based Systems"
              ],
              "product": "Windows 11 version 22H3",
              "vendor": "Microsoft",
              "versions": [
                {
                  "lessThan": "10.0.22631.6649",
                  "status": "affected",
                  "version": "10.0.22631.0",
                  "versionType": "custom"
                }
              ]
            },
            {
              "platforms": [
                "x64-based Systems"
              ],
              "product": "Windows 11 Version 23H2",
              "vendor": "Microsoft",
              "versions": [
                {
                  "lessThan": "10.0.22631.6649",
                  "status": "affected",
                  "version": "10.0.22631.0",
                  "versionType": "custom"
                }
              ]
            },
            {
              "platforms": [
                "ARM64-based Systems",
                "x64-based Systems"
              ],
              "product": "Windows 11 Version 24H2",
              "vendor": "Microsoft",
              "versions": [
                {
                  "lessThan": "10.0.26100.7840",
                  "status": "affected",
                  "version": "10.0.26100.0",
                  "versionType": "custom"
                }
              ]
            },
            {
              "product": "Windows 11 Version 25H2",
              "vendor": "Microsoft",
              "versions": [
                {
                  "lessThan": "10.0.26200.7840",
                  "status": "affected",
                  "version": "10.0.26200.0",
                  "versionType": "custom"
                }
              ]
            },
            {
              "platforms": [
                "ARM64-based Systems"
              ],
              "product": "Windows 11 version 26H1",
              "vendor": "Microsoft",
              "versions": [
                {
                  "lessThan": "10.0.28000.1575",
                  "status": "affected",
                  "version": "10.0.28000.0",
                  "versionType": "custom"
                }
              ]
            },
            {
              "product": "Windows 11 Version 26H1",
              "vendor": "Microsoft",
              "versions": [
                {
                  "lessThan": "10.0.28000.1575",
                  "status": "affected",
                  "version": "10.0.28000.0",
                  "versionType": "custom"
                }
              ]
            },
            {
              "platforms": [
                "x64-based Systems"
              ],
              "product": "Windows Server 2012",
              "vendor": "Microsoft",
              "versions": [
                {
                  "lessThan": "6.2.9200.25923",
                  "status": "affected",
                  "version": "6.2.9200.0",
                  "versionType": "custom"
                }
              ]
            },
            {
              "platforms": [
                "x64-based Systems"
              ],
              "product": "Windows Server 2012 (Server Core installation)",
              "vendor": "Microsoft",
              "versions": [
                {
                  "lessThan": "6.2.9200.25923",
                  "status": "affected",
                  "version": "6.2.9200.0",
                  "versionType": "custom"
                }
              ]
            },
            {
              "platforms": [
                "x64-based Systems"
              ],
              "product": "Windows Server 2012 R2",
              "vendor": "Microsoft",
              "versions": [
                {
                  "lessThan": "6.3.9600.23022",
                  "status": "affected",
                  "version": "6.3.9600.0",
                  "versionType": "custom"
                }
              ]
            },
            {
              "platforms": [
                "x64-based Systems"
              ],
              "product": "Windows Server 2012 R2 (Server Core installation)",
              "vendor": "Microsoft",
              "versions": [
                {
                  "lessThan": "6.3.9600.23022",
                  "status": "affected",
                  "version": "6.3.9600.0",
                  "versionType": "custom"
                }
              ]
            },
            {
              "platforms": [
                "x64-based Systems"
              ],
              "product": "Windows Server 2016",
              "vendor": "Microsoft",
              "versions": [
                {
                  "lessThan": "10.0.14393.8868",
                  "status": "affected",
                  "version": "10.0.14393.0",
                  "versionType": "custom"
                }
              ]
            },
            {
              "platforms": [
                "x64-based Systems"
              ],
              "product": "Windows Server 2016 (Server Core installation)",
              "vendor": "Microsoft",
              "versions": [
                {
                  "lessThan": "10.0.14393.8868",
                  "status": "affected",
                  "version": "10.0.14393.0",
                  "versionType": "custom"
                }
              ]
            },
            {
              "platforms": [
                "x64-based Systems"
              ],
              "product": "Windows Server 2019",
              "vendor": "Microsoft",
              "versions": [
                {
                  "lessThan": "10.0.17763.8389",
                  "status": "affected",
                  "version": "10.0.17763.0",
                  "versionType": "custom"
                }
              ]
            },
            {
              "platforms": [
                "x64-based Systems"
              ],
              "product": "Windows Server 2019 (Server Core installation)",
              "vendor": "Microsoft",
              "versions": [
                {
                  "lessThan": "10.0.17763.8389",
                  "status": "affected",
                  "version": "10.0.17763.0",
                  "versionType": "custom"
                }
              ]
            },
            {
              "platforms": [
                "x64-based Systems"
              ],
              "product": "Windows Server 2022",
              "vendor": "Microsoft",
              "versions": [
                {
                  "lessThan": "10.0.20348.4773",
                  "status": "affected",
                  "version": "10.0.20348.0",
                  "versionType": "custom"
                }
              ]
            },
            {
              "platforms": [
                "x64-based Systems"
              ],
              "product": "Windows Server 2022, 23H2 Edition (Server Core installation)",
              "vendor": "Microsoft",
              "versions": [
                {
                  "lessThan": "10.0.25398.2149",
                  "status": "affected",
                  "version": "10.0.25398.0",
                  "versionType": "custom"
                }
              ]
            },
            {
              "platforms": [
                "x64-based Systems"
              ],
              "product": "Windows Server 2025",
              "vendor": "Microsoft",
              "versions": [
                {
                  "lessThan": "10.0.26100.32370",
                  "status": "affected",
                  "version": "10.0.26100.0",
                  "versionType": "custom"
                }
              ]
            },
            {
              "platforms": [
                "x64-based Systems"
              ],
              "product": "Windows Server 2025 (Server Core installation)",
              "vendor": "Microsoft",
              "versions": [
                {
                  "lessThan": "10.0.26100.32370",
                  "status": "affected",
                  "version": "10.0.26100.0",
                  "versionType": "custom"
                }
              ]
            }
          ],
          "cpeApplicability": [
            {
              "nodes": [
                {
                  "cpeMatch": [
                    {
                      "criteria": "cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x86:*",
                      "versionEndExcluding": "10.0.17763.8389",
                      "versionStartIncluding": "10.0.17763.0",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "10.0.17763.8389",
                      "versionStartIncluding": "10.0.17763.0",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "10.0.17763.8389",
                      "versionStartIncluding": "10.0.17763.0",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "10.0.20348.4773",
                      "versionStartIncluding": "10.0.20348.0",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:microsoft:windows_10_21H2:*:*:*:*:*:*:x86:*",
                      "versionEndExcluding": "10.0.19044.6937",
                      "versionStartIncluding": "10.0.19044.0",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:microsoft:windows_10_22H2:*:*:*:*:*:*:x64:*",
                      "versionEndExcluding": "10.0.19045.6937",
                      "versionStartIncluding": "10.0.19045.0",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "10.0.26100.32370",
                      "versionStartIncluding": "10.0.26100.0",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:microsoft:windows_11_25H2:*:*:*:*:*:*:arm64:*",
                      "versionEndExcluding": "10.0.26200.7840",
                      "versionStartIncluding": "10.0.26200.0",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:microsoft:windows_11_23H2:*:*:*:*:*:*:arm64:*",
                      "versionEndExcluding": "10.0.22631.6649",
                      "versionStartIncluding": "10.0.22631.0",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:microsoft:windows_11_23H2:*:*:*:*:*:*:x64:*",
                      "versionEndExcluding": "10.0.22631.6649",
                      "versionStartIncluding": "10.0.22631.0",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:microsoft:windows_server_23h2:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "10.0.25398.2149",
                      "versionStartIncluding": "10.0.25398.0",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:microsoft:windows_11_24H2:*:*:*:*:*:*:arm64:*",
                      "versionEndExcluding": "10.0.26100.7840",
                      "versionStartIncluding": "10.0.26100.0",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "10.0.26100.32370",
                      "versionStartIncluding": "10.0.26100.0",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x86:*",
                      "versionEndExcluding": "10.0.14393.8868",
                      "versionStartIncluding": "10.0.14393.0",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:microsoft:windows_server_2016:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "10.0.14393.8868",
                      "versionStartIncluding": "10.0.14393.0",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:microsoft:windows_server_2016:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "10.0.14393.8868",
                      "versionStartIncluding": "10.0.14393.0",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:microsoft:windows_server_2012:*:*:*:*:*:*:x64:*",
                      "versionEndExcluding": "6.2.9200.25923",
                      "versionStartIncluding": "6.2.9200.0",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:microsoft:windows_server_2012:*:*:*:*:*:*:x64:*",
                      "versionEndExcluding": "6.2.9200.25923",
                      "versionStartIncluding": "6.2.9200.0",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:microsoft:windows_server_2012_R2:*:*:*:*:*:*:x64:*",
                      "versionEndExcluding": "6.3.9600.23022",
                      "versionStartIncluding": "6.3.9600.0",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:microsoft:windows_server_2012_R2:*:*:*:*:*:*:x64:*",
                      "versionEndExcluding": "6.3.9600.23022",
                      "versionStartIncluding": "6.3.9600.0",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:microsoft:windows_11_26H1:*:*:*:*:*:*:arm64:*",
                      "versionEndExcluding": "10.0.28000.1575",
                      "versionStartIncluding": "10.0.28000.0",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:microsoft:windows_11_26H1:*:*:*:*:*:*:x64:*",
                      "versionEndExcluding": "10.0.28000.1575",
                      "versionStartIncluding": "10.0.28000.0",
                      "vulnerable": true
                    }
                  ],
                  "negate": false,
                  "operator": "OR"
                }
              ]
            }
          ],
          "datePublic": "2026-02-10T16:00:00.000Z",
          "descriptions": [
            {
              "lang": "en-US",
              "value": "Protection mechanism failure in Windows Shell allows an unauthorized attacker to bypass a security feature over a network."
            }
          ],
          "metrics": [
            {
              "cvssV3_1": {
                "baseScore": 8.8,
                "baseSeverity": "HIGH",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C",
                "version": "3.1"
              },
              "format": "CVSS",
              "scenarios": [
                {
                  "lang": "en-US",
                  "value": "GENERAL"
                }
              ]
            }
          ],
          "problemTypes": [
            {
              "descriptions": [
                {
                  "cweId": "CWE-693",
                  "description": "CWE-693: Protection Mechanism Failure",
                  "lang": "en-US",
                  "type": "CWE"
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-08-19T16:26:02.555Z",
            "orgId": "f38d906d-7342-40ea-92c1-6c4a2c6478c8",
            "shortName": "microsoft"
          },
          "references": [
            {
              "name": "Windows Shell Security Feature Bypass Vulnerability",
              "tags": [
                "vendor-advisory",
                "patch"
              ],
              "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21510"
            }
          ],
          "title": "Windows Shell Security Feature Bypass Vulnerability"
        }
      },
      "cveMetadata": {
        "assignerOrgId": "f38d906d-7342-40ea-92c1-6c4a2c6478c8",
        "assignerShortName": "microsoft",
        "cveId": "CVE-2026-21510",
        "datePublished": "2026-02-10T17:51:32.210Z",
        "dateReserved": "2025-12-30T18:10:54.845Z",
        "dateUpdated": "2026-08-19T16:26:02.555Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.