Vulnerability-Lookup

CVE-2026-66795 (GCVE-0-2026-66795)

Vulnerability from cvelistv5 – Published: 2026-08-17 20:45 – Updated: 2026-09-29 19:41

Title

Managedcluster-import-controller: csr auto-approver does not validate certificate subject or signername (spoke→hub cluster-admin)

Summary

A flaw was found in the managedcluster-import-controller. The Certificate Signing Request (CSR) auto-approval logic improperly validates incoming CSRs, specifically by not inspecting the signer name or decoding the PEM-encoded x509 CSR. This vulnerability allows a privileged service account on a spoke cluster to submit a malicious CSR. Successful exploitation can lead to privilege escalation, enabling the attacker to obtain administrative credentials on the hub cluster.

Severity

9.9 (Critical)


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

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-18 15:15 UTC

CWE

CWE-295 - Improper Certificate Validation

Assigner

redhat redhat root Scorecard

References

8 references

URL	Tags
https://access.redhat.com/errata/RHSA-2026:59556	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:59557	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:59558	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:59559	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:59579	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:59593	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/security/cve/CVE-2026-66795	vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2507540	issue-trackingx_refsource_REDHAT

Impacted products

6 products

Vendor	Product	Version
Red Hat	multicluster engine for Kubernetes 2.10	Unaffected: 1787078272 , < * (rpm) cpe:/a:redhat:multicluster_engine:2.10::el9
Red Hat	multicluster engine for Kubernetes 2.11	Unaffected: 1787078330 , < * (rpm) cpe:/a:redhat:multicluster_engine:2.11::el9
Red Hat	multicluster engine for Kubernetes 2.17	Unaffected: 1786577915 , < * (rpm) cpe:/a:redhat:multicluster_engine:2.17::el9
Red Hat	multicluster engine for Kubernetes 2.6	Unaffected: 1787260779 , < * (rpm) cpe:/a:redhat:multicluster_engine:2.6::el9
Red Hat	multicluster engine for Kubernetes 2.8	Unaffected: 1787259044 , < * (rpm) cpe:/a:redhat:multicluster_engine:2.8::el9
Red Hat	multicluster engine for Kubernetes 2.9	Unaffected: 1787078307 , < * (rpm) cpe:/a:redhat:multicluster_engine:2.9::el9

Date Public

2026-08-17 20:29

Show details on NVD website

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          "descriptions": [
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              "lang": "en",
              "value": "A flaw was found in the managedcluster-import-controller. The Certificate Signing Request (CSR) auto-approval logic improperly validates incoming CSRs, specifically by not inspecting the signer name or decoding the PEM-encoded x509 CSR. This vulnerability allows a privileged service account on a spoke cluster to submit a malicious CSR. Successful exploitation can lead to privilege escalation, enabling the attacker to obtain administrative credentials on the hub cluster."
            }
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                  "description": "Improper Certificate Validation",
                  "lang": "en",
                  "type": "CWE"
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              "time": "2026-07-27T00:00:00.000Z",
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            },
            {
              "lang": "en",
              "time": "2026-08-17T20:29:00.000Z",
              "value": "Made public."
            }
          ],
          "title": "Managedcluster-import-controller: csr auto-approver does not validate certificate subject or signername (spoke\u2192hub cluster-admin)",
          "workarounds": [
            {
              "lang": "en",
              "value": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability."
            }
          ],
          "x_generator": {
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          "x_redhatCweChain": "CWE-295: Improper Certificate Validation"
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      },
      "cveMetadata": {
        "assignerOrgId": "53f830b8-0a3f-465b-8143-3b8a9948e749",
        "assignerShortName": "redhat",
        "cveId": "CVE-2026-66795",
        "datePublished": "2026-08-17T20:45:33.786Z",
        "dateReserved": "2026-07-27T17:51:24.886Z",
        "dateUpdated": "2026-09-29T19:41:20.174Z",
        "state": "PUBLISHED"
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      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}

EUVD-2026-378280

European Vulnerability Database identifier assigned by ENISA

Reserved

2026-10-02 08:40

Assigner

ENISA

Alias of

a CVE record, shown under related vulnerabilities. This identifier carries no description, severity or references of its own: they belong to that CVE.

JSON

To clipboard

{
  "assigner": "ENISA",
  "date_reserved": "2026-10-02T08:40:38.964090+00:00",
  "id": "EUVD-2026-378280"
}

FKIE_CVE-2026-66795

Vulnerability from fkie_nvd - Published: 2026-08-17 21:16 - Updated: 2026-09-29 20:17

Severity

9.9 (Critical) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Summary

References

	URL	Tags
	secalert@redhat.com	https://access.redhat.com/errata/RHSA-2026:59556
	secalert@redhat.com	https://access.redhat.com/errata/RHSA-2026:59557
	secalert@redhat.com	https://access.redhat.com/errata/RHSA-2026:59558
	secalert@redhat.com	https://access.redhat.com/errata/RHSA-2026:59559
	secalert@redhat.com	https://access.redhat.com/errata/RHSA-2026:59579
	secalert@redhat.com	https://access.redhat.com/errata/RHSA-2026:59593
	secalert@redhat.com	https://access.redhat.com/security/cve/CVE-2026-66795
	secalert@redhat.com	https://bugzilla.redhat.com/show_bug.cgi?id=2507540

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "collectionURL": "https://catalog.redhat.com/software/containers/",
          "cpes": [
            "cpe:/a:redhat:multicluster_engine:2.10::el9"
          ],
          "defaultStatus": "affected",
          "packageName": "multicluster-engine/managedcluster-import-controller-rhel9",
          "product": "multicluster engine for Kubernetes 2.10",
          "vendor": "Red Hat",
          "versions": [
            {
              "lessThan": "*",
              "status": "unaffected",
              "version": "1787078272",
              "versionType": "rpm"
            }
          ]
        },
        {
          "collectionURL": "https://catalog.redhat.com/software/containers/",
          "cpes": [
            "cpe:/a:redhat:multicluster_engine:2.11::el9"
          ],
          "defaultStatus": "affected",
          "packageName": "multicluster-engine/managedcluster-import-controller-rhel9",
          "product": "multicluster engine for Kubernetes 2.11",
          "vendor": "Red Hat",
          "versions": [
            {
              "lessThan": "*",
              "status": "unaffected",
              "version": "1787078330",
              "versionType": "rpm"
            }
          ]
        },
        {
          "collectionURL": "https://catalog.redhat.com/software/containers/",
          "cpes": [
            "cpe:/a:redhat:multicluster_engine:2.17::el9"
          ],
          "defaultStatus": "affected",
          "packageName": "multicluster-engine/managedcluster-import-controller-rhel9",
          "product": "multicluster engine for Kubernetes 2.17",
          "vendor": "Red Hat",
          "versions": [
            {
              "lessThan": "*",
              "status": "unaffected",
              "version": "1786577915",
              "versionType": "rpm"
            }
          ]
        },
        {
          "collectionURL": "https://catalog.redhat.com/software/containers/",
          "cpes": [
            "cpe:/a:redhat:multicluster_engine:2.6::el9"
          ],
          "defaultStatus": "affected",
          "packageName": "multicluster-engine/managedcluster-import-controller-rhel9",
          "product": "multicluster engine for Kubernetes 2.6",
          "vendor": "Red Hat",
          "versions": [
            {
              "lessThan": "*",
              "status": "unaffected",
              "version": "1787260779",
              "versionType": "rpm"
            }
          ]
        },
        {
          "collectionURL": "https://catalog.redhat.com/software/containers/",
          "cpes": [
            "cpe:/a:redhat:multicluster_engine:2.8::el9"
          ],
          "defaultStatus": "affected",
          "packageName": "multicluster-engine/managedcluster-import-controller-rhel9",
          "product": "multicluster engine for Kubernetes 2.8",
          "vendor": "Red Hat",
          "versions": [
            {
              "lessThan": "*",
              "status": "unaffected",
              "version": "1787259044",
              "versionType": "rpm"
            }
          ]
        },
        {
          "collectionURL": "https://catalog.redhat.com/software/containers/",
          "cpes": [
            "cpe:/a:redhat:multicluster_engine:2.9::el9"
          ],
          "defaultStatus": "affected",
          "packageName": "multicluster-engine/managedcluster-import-controller-rhel9",
          "product": "multicluster engine for Kubernetes 2.9",
          "vendor": "Red Hat",
          "versions": [
            {
              "lessThan": "*",
              "status": "unaffected",
              "version": "1787078307",
              "versionType": "rpm"
            }
          ]
        }
      ],
      "source": "secalert@redhat.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "A flaw was found in the managedcluster-import-controller. The Certificate Signing Request (CSR) auto-approval logic improperly validates incoming CSRs, specifically by not inspecting the signer name or decoding the PEM-encoded x509 CSR. This vulnerability allows a privileged service account on a spoke cluster to submit a malicious CSR. Successful exploitation can lead to privilege escalation, enabling the attacker to obtain administrative credentials on the hub cluster."
    }
  ],
  "id": "CVE-2026-66795",
  "lastModified": "2026-09-29T20:17:22.190",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 9.9,
          "baseSeverity": "CRITICAL",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "CHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 3.1,
        "impactScore": 6.0,
        "source": "secalert@redhat.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
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        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-66795",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-08-18T15:15:25.705433Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-08-17T21:16:47.163",
  "references": [
    {
      "source": "secalert@redhat.com",
      "url": "https://access.redhat.com/errata/RHSA-2026:59556"
    },
    {
      "source": "secalert@redhat.com",
      "url": "https://access.redhat.com/errata/RHSA-2026:59557"
    },
    {
      "source": "secalert@redhat.com",
      "url": "https://access.redhat.com/errata/RHSA-2026:59558"
    },
    {
      "source": "secalert@redhat.com",
      "url": "https://access.redhat.com/errata/RHSA-2026:59559"
    },
    {
      "source": "secalert@redhat.com",
      "url": "https://access.redhat.com/errata/RHSA-2026:59579"
    },
    {
      "source": "secalert@redhat.com",
      "url": "https://access.redhat.com/errata/RHSA-2026:59593"
    },
    {
      "source": "secalert@redhat.com",
      "url": "https://access.redhat.com/security/cve/CVE-2026-66795"
    },
    {
      "source": "secalert@redhat.com",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2507540"
    }
  ],
  "sourceIdentifier": "secalert@redhat.com",
  "vulnStatus": "Awaiting Analysis",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-295"
        }
      ],
      "source": "secalert@redhat.com",
      "type": "Secondary"
    }
  ]
}

GHSA-W9C6-W29V-4VP6

Vulnerability from github – Published: 2026-08-17 21:31 – Updated: 2026-09-02 00:31

Details

Severity

9.1 (Critical)


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

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-66795"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-295"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-17T21:16:47Z",
    "severity": "CRITICAL"
  },
  "details": "A flaw was found in the managedcluster-import-controller. The Certificate Signing Request (CSR) auto-approval logic improperly validates incoming CSRs, specifically by not inspecting the signer name or decoding the PEM-encoded x509 CSR. This vulnerability allows a privileged service account on a spoke cluster to submit a malicious CSR. Successful exploitation can lead to privilege escalation, enabling the attacker to obtain administrative credentials on the hub cluster.",
  "id": "GHSA-w9c6-w29v-4vp6",
  "modified": "2026-09-02T00:31:27Z",
  "published": "2026-08-17T21:31:25Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-66795"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/errata/RHSA-2026:59556"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/errata/RHSA-2026:59557"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/errata/RHSA-2026:59558"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/errata/RHSA-2026:59559"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/errata/RHSA-2026:59579"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/errata/RHSA-2026:59593"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/security/cve/CVE-2026-66795"
    },
    {
      "type": "WEB",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2507540"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

RHSA-2026:59556

Vulnerability from csaf_redhat - Published: 2026-08-25 18:37 - Updated: 2026-10-02 17:22

Summary

Red Hat Security Advisory: multicluster engine for Kubernetes v2.11.6 security update

Severity

Important

Scope

14 vulnerabilities in this advisory, including CVE-2026-66795.

CVE-2026-66795

9.9 (Critical)


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

Fixed: 4 products Known not affected: 124 products

https://access.redhat.com/errata/RHSA-2026:59556

Open the full advisory

RHSA-2026:59557

Vulnerability from csaf_redhat - Published: 2026-08-25 18:46 - Updated: 2026-10-02 17:42

Summary

Red Hat Security Advisory: multicluster engine for Kubernetes v2.10.6 security update

Severity

Important

Scope

14 vulnerabilities in this advisory, including CVE-2026-66795.

CVE-2026-66795

9.9 (Critical)


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

Fixed: 4 products Known not affected: 120 products

https://access.redhat.com/errata/RHSA-2026:59557

Open the full advisory

RHSA-2026:59558

Vulnerability from csaf_redhat - Published: 2026-08-25 18:48 - Updated: 2026-10-02 17:44

Summary

Red Hat Security Advisory: multicluster engine for Kubernetes v2.8.10 security update

Severity

Important

Scope

30 vulnerabilities in this advisory, including CVE-2026-66795.

CVE-2026-66795

9.9 (Critical)


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

Fixed: 4 products Known not affected: 104 products

https://access.redhat.com/errata/RHSA-2026:59558

Open the full advisory

RHSA-2026:59559

Vulnerability from csaf_redhat - Published: 2026-08-25 18:50 - Updated: 2026-10-02 17:45

Summary

Red Hat Security Advisory: multicluster engine for Kubernetes v2.9.7 security update

Severity

Important

Scope

31 vulnerabilities in this advisory, including CVE-2026-66795.

CVE-2026-66795

9.9 (Critical)


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

Fixed: 4 products Known not affected: 116 products

https://access.redhat.com/errata/RHSA-2026:59559

Open the full advisory

RHSA-2026:59579

Vulnerability from csaf_redhat - Published: 2026-08-25 19:37 - Updated: 2026-10-02 17:45

Summary

Red Hat Security Advisory: multicluster engine for Kubernetes v2.6.14 security update

Severity

Important

Scope

26 vulnerabilities in this advisory, including CVE-2026-66795.

CVE-2026-66795

9.9 (Critical)


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

Fixed: 4 products Known not affected: 104 products

https://access.redhat.com/errata/RHSA-2026:59579

Open the full advisory

RHSA-2026:59593

Vulnerability from csaf_redhat - Published: 2026-08-25 19:56 - Updated: 2026-10-02 17:32

Summary

Red Hat Security Advisory: multicluster engine for Kubernetes v2.17.2 security update

Severity

Important

Scope

25 vulnerabilities in this advisory, including CVE-2026-66795.

CVE-2026-66795

9.9 (Critical)


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

Fixed: 4 products Known not affected: 136 products

https://access.redhat.com/errata/RHSA-2026:59593

Open the full advisory

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

CVE-2026-66795 (GCVE-0-2026-66795)

Tags

Sightings

Nomenclature

Related by attack behaviour