{"id":"CVE-2026-73266","title":"A flaw was found in the clusterclaims-controller component of Multicluster Engine (MCE)","summary":"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 Mana…","severity":"high","cvss":7.1,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:N","cwe":["CWE-441"],"vendor":"Red Hat","product":"multicluster-engine/clusterclaims-controller-rhel9","affected":["multicluster-engine/clusterclaims-controller-rhel9 (all versions)","multicluster-engine/clusterclaims-controller-rhel9 (all versions)","multicluster-engine/clusterclaims-controller-rhel9 (all versions)","multicluster-engine/clusterclaims-controller-rhel9 (all versions)","multicluster-engine/clusterclaims-controller-rhel9 (all versions)","multicluster-engine/clusterclaims-controller-rhel9 (all versions)"],"published":"2026-08-13","updated":"2026-09-08","sourceUpdated":"2026-09-08T13:17:21.923","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-73266","references":[{"url":"https://access.redhat.com/errata/RHSA-2026:59556","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:59557","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:59558","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:59559","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:59579","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:59593","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/security/cve/CVE-2026-73266","label":"secalert@redhat.com"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2514217","label":"secalert@redhat.com"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-73266.json"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-73266"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-73266"}],"tags":["nvd","cve.org","csaf","vex","red-hat"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-08-18T01:25:32.223923Z"},"epss":0.00215,"epssPercentile":0.12186,"ingestedAt":"2026-09-05T18:43:14.057Z","patched":["multicluster_engine_for_kubernetes 2.11","multicluster_engine_for_kubernetes 2.17","multicluster_engine_for_kubernetes 2.1","multicluster_engine_for_kubernetes 2.6","multicluster_engine_for_kubernetes 2.8","multicluster_engine_for_kubernetes 2.9"],"slug":"CVE-2026-73266","body":"## Overview\n\nA 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **RHSA-2026:59556** · Red Hat · fixed in: multicluster engine for Kubernetes 2.11 · released 2026-08-25 · [advisory](https://access.redhat.com/errata/RHSA-2026:59556)\n- **RHSA-2026:59593** · Red Hat · fixed in: multicluster engine for Kubernetes 2.17 · released 2026-08-25 · [advisory](https://access.redhat.com/errata/RHSA-2026:59593)\n- **RHSA-2026:59557** · Red Hat · fixed in: multicluster engine for Kubernetes 2.1 · released 2026-08-25 · [advisory](https://access.redhat.com/errata/RHSA-2026:59557)\n- **RHSA-2026:59579** · Red Hat · fixed in: multicluster engine for Kubernetes 2.6 · released 2026-08-25 · [advisory](https://access.redhat.com/errata/RHSA-2026:59579)\n- **RHSA-2026:59558** · Red Hat · fixed in: multicluster engine for Kubernetes 2.8 · released 2026-08-25 · [advisory](https://access.redhat.com/errata/RHSA-2026:59558)\n- **RHSA-2026:59559** · Red Hat · fixed in: multicluster engine for Kubernetes 2.9 · released 2026-08-25 · [advisory](https://access.redhat.com/errata/RHSA-2026:59559)","depth":"twilight","depthScore":39,"depthScoreParts":{"impact":39.1,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}