{"id":"GHSA-q4gv-pjmh-c735","revision":"b730a93898494b3f98580f46be8900ee","records":[{"revision":"b730a93898494b3f98580f46be8900ee","observedAt":"2026-10-24T13:19:41.952+00:00","statement":{"source":"osv","id":"GHSA-q4gv-pjmh-c735","aliases":["CVE-2026-4740","GO-2026-5564"],"title":"Open Cluster Management (OCM): Cross-cluster privilege escalation via improper Kubernetes client certificate renewal validation","description":"A flaw was found in Open Cluster Management (OCM), the technology underlying Red Hat Advanced Cluster Management (ACM). Improper validation of Kubernetes client certificate renewal allows a managed cluster administrator to forge a client certificate that can be approved by the OCM controller. This enables cross-cluster privilege escalation and may allow an attacker to gain control over other managed clusters, including the hub cluster.","state":0,"publishedAt":"2026-04-07T15:30:52+00:00","modifiedAt":"2026-06-25T23:11:37.1132189+00:00","affected":[{"ecosystem":"Go","name":"open-cluster-management.io/ocm","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"1.2.1"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V3","vector":"CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"HIGH"}],"references":["https://nvd.nist.gov/vuln/detail/CVE-2026-4740","https://github.com/open-cluster-management-io/ocm/commit/9e70cc1e21a15239c81111062c0b37df4b5a8026","https://access.redhat.com/security/cve/CVE-2026-4740","https://blog.arfevrier.fr/open-cluster-management-cross-cluster-escape","https://bugzilla.redhat.com/show_bug.cgi?id=2450590","https://github.com/open-cluster-management-io/OCM"],"sourceUrl":"https://github.com/advisories/GHSA-q4gv-pjmh-c735","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-q4gv-pjmh-c735","identifiers":["GHSA-q4gv-pjmh-c735","CVE-2026-4740","GO-2026-5564"]},"retained":false,"historicalAffected":[]}],"coverage":[]}