Vulnerability-Lookup

WID-SEC-W-2026-2417

Vulnerability from csaf_certbund - Published: 2026-07-19 22:00 - Updated: 2026-07-19 22:00

Summary

Proxmox Virtual Environment: Mehrere Schwachstellen

Severity

Mittel

Notes

Das BSI ist als Anbieter für die eigenen, zur Nutzung bereitgestellten Inhalte nach den allgemeinen Gesetzen verantwortlich. Nutzerinnen und Nutzer sind jedoch dafür verantwortlich, die Verwendung und/oder die Umsetzung der mit den Inhalten bereitgestellten Informationen sorgfältig im Einzelfall zu prüfen.

Produktbeschreibung: Proxmox Virtual Environment (PVE) ist eine Virtualisierungsplattform für Server.

Angriff: Ein Angreifer kann mehrere Schwachstellen in Proxmox Virtual Environment ausnutzen, um einen Cross-Site Scripting Angriff durchzuführen, Sicherheitsmaßnahmen zu umgehen und vertrauliche Informationen offenzulegen.

Betroffene Betriebssysteme: - Sonstiges - UNIX

CVE-2026-51081

Affected products

Known affected 3 products

Product	Identifier	Version
Proxmox Virtual Environment datacenter-manager-ui Proxmox / Virtual Environment	`cpe:/a:proxmox:virtual_environment:datacenter-manager-ui`	datacenter-manager-ui
Proxmox Virtual Environment ibrust-proxmox-yew-comp-dev Proxmox / Virtual Environment	`cpe:/a:proxmox:virtual_environment:ibrust-proxmox-yew-comp-dev`	ibrust-proxmox-yew-comp-dev
Proxmox Virtual Environment widget-toolkit Proxmox / Virtual Environment	`cpe:/a:proxmox:virtual_environment:widget-toolkit`	widget-toolkit

CVE-2026-51082

Affected products

Known affected 3 products

Product	Identifier	Version
Proxmox Virtual Environment pve-manager Proxmox / Virtual Environment	`cpe:/a:proxmox:virtual_environment:pve-manager`	pve-manager
Proxmox Virtual Environment qemu-server Proxmox / Virtual Environment	`cpe:/a:proxmox:virtual_environment:qemu-server`	qemu-server
Proxmox Virtual Environment pve-container Proxmox / Virtual Environment	`cpe:/a:proxmox:virtual_environment:pve-container`	pve-container

CVE-2026-51083

Affected products

Known affected 1 product

Product	Identifier	Version	Remediation
Proxmox Virtual Environment qemu-server Proxmox / Virtual Environment	`cpe:/a:proxmox:virtual_environment:qemu-server`	qemu-server

References

5 references

URL	Category
https://wid.cert-bund.de/.well-known/csaf/white/2…	self
https://wid.cert-bund.de/portal/wid/securityadvis…	self
https://github.com/advisories/GHSA-QQMV-HGV3-7GX2	external
https://github.com/advisories/GHSA-VJF4-FXGW-F2MH	external
https://github.com/advisories/GHSA-3Q5R-Q6QF-QQ6P	external

JSON

To clipboard

{
  "document": {
    "aggregate_severity": {
      "text": "mittel"
    },
    "category": "csaf_base",
    "csaf_version": "2.0",
    "distribution": {
      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
      }
    },
    "lang": "de-DE",
    "notes": [
      {
        "category": "legal_disclaimer",
        "text": "Das BSI ist als Anbieter f\u00fcr die eigenen, zur Nutzung bereitgestellten Inhalte nach den allgemeinen Gesetzen verantwortlich. Nutzerinnen und Nutzer sind jedoch daf\u00fcr verantwortlich, die Verwendung und/oder die Umsetzung der mit den Inhalten bereitgestellten Informationen sorgf\u00e4ltig im Einzelfall zu pr\u00fcfen."
      },
      {
        "category": "description",
        "text": "Proxmox Virtual Environment (PVE) ist eine Virtualisierungsplattform f\u00fcr Server.",
        "title": "Produktbeschreibung"
      },
      {
        "category": "summary",
        "text": "Ein Angreifer kann mehrere Schwachstellen in Proxmox Virtual Environment ausnutzen, um einen Cross-Site Scripting Angriff durchzuf\u00fchren, Sicherheitsma\u00dfnahmen zu umgehen und vertrauliche Informationen offenzulegen.",
        "title": "Angriff"
      },
      {
        "category": "general",
        "text": "- Sonstiges\n- UNIX",
        "title": "Betroffene Betriebssysteme"
      }
    ],
    "publisher": {
      "category": "other",
      "contact_details": "csaf-provider@cert-bund.de",
      "name": "Bundesamt f\u00fcr Sicherheit in der Informationstechnik",
      "namespace": "https://www.bsi.bund.de"
    },
    "references": [
      {
        "category": "self",
        "summary": "WID-SEC-W-2026-2417 - CSAF Version",
        "url": "https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-2417.json"
      },
      {
        "category": "self",
        "summary": "WID-SEC-2026-2417 - Portal Version",
        "url": "https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-2417"
      },
      {
        "category": "external",
        "summary": "GitHub Security Advisory GHSA-QQMV-HGV3-7GX2 vom 2026-07-19",
        "url": "https://github.com/advisories/GHSA-QQMV-HGV3-7GX2"
      },
      {
        "category": "external",
        "summary": "GitHub Security Advisory GHSA-QQMV-HGV3-7GX2 vom 2026-07-19",
        "url": "https://github.com/advisories/GHSA-VJF4-FXGW-F2MH"
      },
      {
        "category": "external",
        "summary": "GitHub Security Advisory GHSA-3q5r-q6qf-qq6p vom 2026-07-19",
        "url": "https://github.com/advisories/GHSA-3Q5R-Q6QF-QQ6P"
      }
    ],
    "source_lang": "en-US",
    "title": "Proxmox Virtual Environment: Mehrere Schwachstellen",
    "tracking": {
      "current_release_date": "2026-07-19T22:00:00.000+00:00",
      "generator": {
        "date": "2026-07-20T10:37:55.038+00:00",
        "engine": {
          "name": "BSI-WID",
          "version": "1.6.0"
        }
      },
      "id": "WID-SEC-W-2026-2417",
      "initial_release_date": "2026-07-19T22:00:00.000+00:00",
      "revision_history": [
        {
          "date": "2026-07-19T22:00:00.000+00:00",
          "number": "1",
          "summary": "Initiale Fassung"
        }
      ],
      "status": "final",
      "version": "1"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version",
                "name": "widget-toolkit",
                "product": {
                  "name": "Proxmox Virtual Environment widget-toolkit",
                  "product_id": "T056819",
                  "product_identification_helper": {
                    "cpe": "cpe:/a:proxmox:virtual_environment:widget-toolkit"
                  }
                }
              },
              {
                "category": "product_version",
                "name": "datacenter-manager-ui",
                "product": {
                  "name": "Proxmox Virtual Environment datacenter-manager-ui",
                  "product_id": "T056820",
                  "product_identification_helper": {
                    "cpe": "cpe:/a:proxmox:virtual_environment:datacenter-manager-ui"
                  }
                }
              },
              {
                "category": "product_version",
                "name": "ibrust-proxmox-yew-comp-dev",
                "product": {
                  "name": "Proxmox Virtual Environment ibrust-proxmox-yew-comp-dev",
                  "product_id": "T056821",
                  "product_identification_helper": {
                    "cpe": "cpe:/a:proxmox:virtual_environment:ibrust-proxmox-yew-comp-dev"
                  }
                }
              },
              {
                "category": "product_version",
                "name": "pve-manager",
                "product": {
                  "name": "Proxmox Virtual Environment pve-manager",
                  "product_id": "T056822",
                  "product_identification_helper": {
                    "cpe": "cpe:/a:proxmox:virtual_environment:pve-manager"
                  }
                }
              },
              {
                "category": "product_version",
                "name": "qemu-server",
                "product": {
                  "name": "Proxmox Virtual Environment qemu-server",
                  "product_id": "T056823",
                  "product_identification_helper": {
                    "cpe": "cpe:/a:proxmox:virtual_environment:qemu-server"
                  }
                }
              },
              {
                "category": "product_version",
                "name": "pve-container",
                "product": {
                  "name": "Proxmox Virtual Environment pve-container",
                  "product_id": "T056824",
                  "product_identification_helper": {
                    "cpe": "cpe:/a:proxmox:virtual_environment:pve-container"
                  }
                }
              }
            ],
            "category": "product_name",
            "name": "Virtual Environment"
          }
        ],
        "category": "vendor",
        "name": "Proxmox"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2026-51081",
      "product_status": {
        "known_affected": [
          "T056820",
          "T056821",
          "T056819"
        ]
      },
      "release_date": "2026-07-19T22:00:00.000+00:00",
      "title": "CVE-2026-51081"
    },
    {
      "cve": "CVE-2026-51082",
      "product_status": {
        "known_affected": [
          "T056822",
          "T056823",
          "T056824"
        ]
      },
      "release_date": "2026-07-19T22:00:00.000+00:00",
      "title": "CVE-2026-51082"
    },
    {
      "cve": "CVE-2026-51083",
      "product_status": {
        "known_affected": [
          "T056823"
        ]
      },
      "release_date": "2026-07-19T22:00:00.000+00:00",
      "title": "CVE-2026-51083"
    }
  ]
}

CVE-2026-51081 (GCVE-0-2026-51081)

Vulnerability from cvelistv5 – Published: 2026-07-17 00:00 – Updated: 2026-07-17 15:13

Summary

A cross-site scripting (XSS) vulnerability in Proxmox Virtual Environment (PVE) 9.x 5.1.8 and Proxmox Virtual Environment (PVE) 8.x 4.3.16 allows attackers to execute arbitrary web scripts or HTML via injecting a crafted payload.

Severity

6.1 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-07-17 15:12 UTC

CWE

n/a
CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Assigner

mitre mitre root Scorecard

References

1 reference

URL	Tags
https://forum.proxmox.com/threads/proxmox-virtual…

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "NETWORK",
              "availabilityImpact": "NONE",
              "baseScore": 6.1,
              "baseSeverity": "MEDIUM",
              "confidentialityImpact": "LOW",
              "integrityImpact": "LOW",
              "privilegesRequired": "NONE",
              "scope": "CHANGED",
              "userInteraction": "REQUIRED",
              "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2026-51081",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-07-17T15:12:31.019464Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "problemTypes": [
          {
            "descriptions": [
              {
                "cweId": "CWE-79",
                "description": "CWE-79 Improper Neutralization of Input During Web Page Generation (\u0027Cross-site Scripting\u0027)",
                "lang": "en",
                "type": "CWE"
              }
            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-07-17T15:13:18.023Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "n/a",
          "vendor": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "A cross-site scripting (XSS) vulnerability in Proxmox Virtual Environment (PVE) 9.x 5.1.8 and Proxmox Virtual Environment (PVE) 8.x 4.3.16 allows attackers to execute arbitrary web scripts or HTML via injecting a crafted payload."
        }
      ],
      "problemTypes": [
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          "descriptions": [
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              "description": "n/a",
              "lang": "en",
              "type": "text"
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        "dateUpdated": "2026-07-17T14:09:19.891Z",
        "orgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
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      },
      "references": [
        {
          "url": "https://forum.proxmox.com/threads/proxmox-virtual-environment-security-advisories.149331/post-849973"
        }
      ]
    }
  },
  "cveMetadata": {
    "assignerOrgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
    "assignerShortName": "mitre",
    "cveId": "CVE-2026-51081",
    "datePublished": "2026-07-17T00:00:00.000Z",
    "dateReserved": "2026-06-07T00:00:00.000Z",
    "dateUpdated": "2026-07-17T15:13:18.023Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

CVE-2026-51082 (GCVE-0-2026-51082)

Vulnerability from cvelistv5 – Published: 2026-07-17 00:00 – Updated: 2026-07-17 16:44

Summary

A race condition between the vncproxy and vncwebsocket API calls in Proxmox Virtual Environment (PVE) 9.x pve-manager before 9.1.9 and 8.x before 8.4.19; qemu-server 9.x before 9.1.7 and 8.x before 8.4.7; and pve-container before 6.1.3 (PVE 9.x) and before 5.3.4 (PVE 8.x) allows an attacker with privileges to call "vncproxy" to hijack a VNC session that is established in parallel by a different user for a different VM.

Severity

7.2 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-07-17 16:44 UTC

CWE

n/a
CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

Assigner

mitre mitre root Scorecard

References

1 reference

URL	Tags
https://forum.proxmox.com/threads/proxmox-virtual…

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "NETWORK",
              "availabilityImpact": "HIGH",
              "baseScore": 7.2,
              "baseSeverity": "HIGH",
              "confidentialityImpact": "HIGH",
              "integrityImpact": "HIGH",
              "privilegesRequired": "HIGH",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2026-51082",
                "options": [
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                    "Exploitation": "none"
                  },
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                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-07-17T16:44:15.514638Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "problemTypes": [
          {
            "descriptions": [
              {
                "cweId": "CWE-362",
                "description": "CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization (\u0027Race Condition\u0027)",
                "lang": "en",
                "type": "CWE"
              }
            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-07-17T16:44:44.740Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "n/a",
          "vendor": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "A race condition between the vncproxy and vncwebsocket API calls in Proxmox Virtual Environment (PVE) 9.x pve-manager before 9.1.9 and 8.x before 8.4.19; qemu-server 9.x before 9.1.7 and 8.x before 8.4.7; and pve-container before 6.1.3 (PVE 9.x) and before 5.3.4 (PVE 8.x) allows an attacker with privileges to call \"vncproxy\" to hijack a VNC session that is established in parallel by a different user for a different VM."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "description": "n/a",
              "lang": "en",
              "type": "text"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-17T14:48:35.866Z",
        "orgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
        "shortName": "mitre"
      },
      "references": [
        {
          "url": "https://forum.proxmox.com/threads/proxmox-virtual-environment-security-advisories.149331/post-849971"
        }
      ]
    }
  },
  "cveMetadata": {
    "assignerOrgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
    "assignerShortName": "mitre",
    "cveId": "CVE-2026-51082",
    "datePublished": "2026-07-17T00:00:00.000Z",
    "dateReserved": "2026-06-07T00:00:00.000Z",
    "dateUpdated": "2026-07-17T16:44:44.740Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

CVE-2026-51083 (GCVE-0-2026-51083)

Vulnerability from cvelistv5 – Published: 2026-07-17 00:00 – Updated: 2026-07-17 15:26

Summary

Incorrect access control in Proxmox Virtual Environment (PVE) 9.x qemu-server before 9.1.8 and 8.x before 8.4.8 allows users within limited privileges to obtain hashed passwords via the cloudinit/dump API.

Severity

6.5 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-07-17 15:26 UTC

CWE

n/a
CWE-284 - Improper Access Control

Assigner

mitre mitre root Scorecard

References

1 reference

URL	Tags
https://forum.proxmox.com/threads/proxmox-virtual…

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "NETWORK",
              "availabilityImpact": "NONE",
              "baseScore": 6.5,
              "baseSeverity": "MEDIUM",
              "confidentialityImpact": "HIGH",
              "integrityImpact": "NONE",
              "privilegesRequired": "LOW",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2026-51083",
                "options": [
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                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-07-17T15:26:09.925292Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "problemTypes": [
          {
            "descriptions": [
              {
                "cweId": "CWE-284",
                "description": "CWE-284 Improper Access Control",
                "lang": "en",
                "type": "CWE"
              }
            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-07-17T15:26:43.644Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "n/a",
          "vendor": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
            }
          ]
        }
      ],
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        {
          "lang": "en",
          "value": "Incorrect access control in Proxmox Virtual Environment (PVE) 9.x qemu-server before 9.1.8 and 8.x before 8.4.8 allows users within limited privileges to obtain hashed passwords via the cloudinit/dump API."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "description": "n/a",
              "lang": "en",
              "type": "text"
            }
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      ],
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        "dateUpdated": "2026-07-17T14:41:54.692Z",
        "orgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
        "shortName": "mitre"
      },
      "references": [
        {
          "url": "https://forum.proxmox.com/threads/proxmox-virtual-environment-security-advisories.149331/page-2#post-84997"
        }
      ]
    }
  },
  "cveMetadata": {
    "assignerOrgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
    "assignerShortName": "mitre",
    "cveId": "CVE-2026-51083",
    "datePublished": "2026-07-17T00:00:00.000Z",
    "dateReserved": "2026-06-07T00:00:00.000Z",
    "dateUpdated": "2026-07-17T15:26:43.644Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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.

Action not permitted

WID-SEC-W-2026-2417

CVE-2026-51081 (GCVE-0-2026-51081)

CVE-2026-51082 (GCVE-0-2026-51082)

CVE-2026-51083 (GCVE-0-2026-51083)

Tags

Sightings

Nomenclature

Related by attack behaviour