High

Clusterclaims-controller: confused deputy: tenant-controlled clusterclaim labels propagated to managedcluster, enabling cross-tenant managedclusterset join

Type: advisorySource: Official CVE List1 source record

A flaw was found in the clusterclaims-controller component of Multicluster Engine (MCE). An authenticated tenant can exploit this vulnerability by manipulating ClusterClaim labels. This allows the tenant to force a cluster to join a ManagedClusterSet belonging to another tenant. Such unauthorized access could enable the injection of policies and workloads into other tenants' clusters.

Announced 13 Aug 2026Group revision 1

Original source ↗

CVE-2026-73266

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-2026-73266

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": "1787196014",
        "lessThan": "*",
        "versionType": "rpm"
      }
    ],
    "packageName": "multicluster-engine/clusterclaims-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": "1787239442",
        "lessThan": "*",
        "versionType": "rpm"
      }
    ],
    "packageName": "multicluster-engine/clusterclaims-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": "1786577950",
        "lessThan": "*",
        "versionType": "rpm"
      }
    ],
    "packageName": "multicluster-engine/clusterclaims-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": "1787259112",
        "lessThan": "*",
        "versionType": "rpm"
      }
    ],
    "packageName": "multicluster-engine/clusterclaims-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": "1787259059",
        "lessThan": "*",
        "versionType": "rpm"
      }
    ],
    "packageName": "multicluster-engine/clusterclaims-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": "1787195995",
        "lessThan": "*",
        "versionType": "rpm"
      }
    ],
    "packageName": "multicluster-engine/clusterclaims-controller-rhel9",
    "collectionURL": "https://catalog.redhat.com/software/containers/",
    "defaultStatus": "affected"
  }
]

Related CVEs: CVE-2026-73266
Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event: #3985 · Revision 1
Added to Heist Feed: Sat, 24 Oct 2026 21:44:38 GMT
Publisher date: Thu, 13 Aug 2026 16:36:45 GMT

Read the original announcement

Revision history

24 Oct 2026CVE-2026-73266 · Revision 1Source updated