Critical

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

Type: advisorySource: Official CVE List1 source record

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.

Announced 17 Aug 2026Group revision 1

Original source ↗

CVE-2026-66795

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-66795

multicluster engine for Kubernetes 2.10

Source reference: /containers/cna/affected/0/product

Affected versions: Not stated in this record
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

multicluster engine for Kubernetes 2.11

Source reference: /containers/cna/affected/1/product

Affected versions: Not stated in this record
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

multicluster engine for Kubernetes 2.17

Source reference: /containers/cna/affected/2/product

Affected versions: Not stated in this record
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

multicluster engine for Kubernetes 2.6

Source reference: /containers/cna/affected/3/product

Affected versions: Not stated in this record
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

multicluster engine for Kubernetes 2.8

Source reference: /containers/cna/affected/4/product

Affected versions: Not stated in this record
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

multicluster engine for Kubernetes 2.9

Source reference: /containers/cna/affected/5/product

Affected versions: Not stated in this record
Fixed versions: Not stated in this record
Prerequisites: Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "cpes": [
      "cpe:/a:redhat:multicluster_engine:2.10::el9"
    ],
    "vendor": "Red Hat",
    "product": "multicluster engine for Kubernetes 2.10",
    "versions": [
      {
        "status": "unaffected",
        "version": "1787078272",
        "lessThan": "*",
        "versionType": "rpm"
      }
    ],
    "packageName": "multicluster-engine/managedcluster-import-controller-rhel9",
    "collectionURL": "https://catalog.redhat.com/software/containers/",
    "defaultStatus": "affected"
  },
  {
    "cpes": [
      "cpe:/a:redhat:multicluster_engine:2.11::el9"
    ],
    "vendor": "Red Hat",
    "product": "multicluster engine for Kubernetes 2.11",
    "versions": [
      {
        "status": "unaffected",
        "version": "1787078330",
        "lessThan": "*",
        "versionType": "rpm"
      }
    ],
    "packageName": "multicluster-engine/managedcluster-import-controller-rhel9",
    "collectionURL": "https://catalog.redhat.com/software/containers/",
    "defaultStatus": "affected"
  },
  {
    "cpes": [
      "cpe:/a:redhat:multicluster_engine:2.17::el9"
    ],
    "vendor": "Red Hat",
    "product": "multicluster engine for Kubernetes 2.17",
    "versions": [
      {
        "status": "unaffected",
        "version": "1786577915",
        "lessThan": "*",
        "versionType": "rpm"
      }
    ],
    "packageName": "multicluster-engine/managedcluster-import-controller-rhel9",
    "collectionURL": "https://catalog.redhat.com/software/containers/",
    "defaultStatus": "affected"
  },
  {
    "cpes": [
      "cpe:/a:redhat:multicluster_engine:2.6::el9"
    ],
    "vendor": "Red Hat",
    "product": "multicluster engine for Kubernetes 2.6",
    "versions": [
      {
        "status": "unaffected",
        "version": "1787260779",
        "lessThan": "*",
        "versionType": "rpm"
      }
    ],
    "packageName": "multicluster-engine/managedcluster-import-controller-rhel9",
    "collectionURL": "https://catalog.redhat.com/software/containers/",
    "defaultStatus": "affected"
  },
  {
    "cpes": [
      "cpe:/a:redhat:multicluster_engine:2.8::el9"
    ],
    "vendor": "Red Hat",
    "product": "multicluster engine for Kubernetes 2.8",
    "versions": [
      {
        "status": "unaffected",
        "version": "1787259044",
        "lessThan": "*",
        "versionType": "rpm"
      }
    ],
    "packageName": "multicluster-engine/managedcluster-import-controller-rhel9",
    "collectionURL": "https://catalog.redhat.com/software/containers/",
    "defaultStatus": "affected"
  },
  {
    "cpes": [
      "cpe:/a:redhat:multicluster_engine:2.9::el9"
    ],
    "vendor": "Red Hat",
    "product": "multicluster engine for Kubernetes 2.9",
    "versions": [
      {
        "status": "unaffected",
        "version": "1787078307",
        "lessThan": "*",
        "versionType": "rpm"
      }
    ],
    "packageName": "multicluster-engine/managedcluster-import-controller-rhel9",
    "collectionURL": "https://catalog.redhat.com/software/containers/",
    "defaultStatus": "affected"
  }
]

Related CVEs: CVE-2026-66795
Source reference: /cveMetadata/cveId

Publisher severity

critical

Source reference: /containers/cna/metrics

Event: #3982 · Revision 1
Added to Heist Feed: Sat, 24 Oct 2026 21:44:36 GMT
Publisher date: Mon, 17 Aug 2026 20:45:33 GMT

Read the original announcement

Revision history

24 Oct 2026CVE-2026-66795 · Revision 1Source updated