{"cve":"CVE-2026-4740","nvd":{"published":"2026-04-07T15:17:46.797","modified":"2026-10-26T21:10:00.170","status":"Modified","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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H","score":8.2},"cwes":["CWE-295"],"references":["https://access.redhat.com/errata/RHSA-2026:11414","https://access.redhat.com/errata/RHSA-2026:13542","https://access.redhat.com/errata/RHSA-2026:13853","https://access.redhat.com/errata/RHSA-2026:8218","https://access.redhat.com/errata/RHSA-2026:9848"],"products":["redhat:advanced_cluster_management_for_kubernetes"],"source":"nvd","synced_at":"2026-10-26T21:38:48.864438205+00:00"},"epss":{"cve":"CVE-2026-4740","score":0.00148,"percentile":0.04002,"date":"2026-10-26"},"kev":null,"osv":[{"id":"GHSA-q4gv-pjmh-c735","url":"https://osv.dev/vulnerability/GHSA-q4gv-pjmh-c735","summary":"Open Cluster Management (OCM): Cross-cluster privilege escalation via improper Kubernetes client certificate renewal validation","modified":"2026-06-25T23:11:37.113218915Z","packages":[{"ecosystem":"Go","name":"open-cluster-management.io/ocm","purl":"pkg:golang/open-cluster-management.io/ocm","ranges":["<1.2.1"],"fixed":["1.2.1"]}]},{"id":"GO-2026-5564","url":"https://osv.dev/vulnerability/GO-2026-5564","summary":"Open Cluster Management (OCM): Cross-cluster privilege escalation via improper Kubernetes client certificate renewal validation in open-cluster-management.io/ocm","modified":"2026-06-25T23:01:31.584689988Z","packages":[{"ecosystem":"Go","name":"open-cluster-management.io/ocm","purl":"pkg:golang/open-cluster-management.io/ocm","ranges":["<1.2.1"],"fixed":["1.2.1"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}