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EUVD-2026-19690 · Published Apr 7, 2026
Open Cluster Management (OCM): Cross-cluster privilege escalation via improper Kubernetes client certificate renewal validation 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.
Technologies
Redhat Advanced Cluster Management For KubernetesOpen-Cluster-Management.Io Ocm
Weaknesses
CWE-295
CVSS scores
- v3.18.2
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
MITRE ATT&CK
InferredWhere this vulnerability fits in an attack
Privilege Escalation
References
- https://blog.arfevrier.fr/open-cluster-management-cross-cluster-escape/
- https://access.redhat.com/security/cve/CVE-2026-4740
- https://bugzilla.redhat.com/show_bug.cgi?id=2450590
- https://nvd.nist.gov/vuln/detail/CVE-2026-4740
- https://github.com/open-cluster-management-io/ocm/commit/9e70cc1e21a15239c81111062c0b37df4b5a8026
- https://blog.arfevrier.fr/open-cluster-management-cross-cluster-escape
Potentially impacted assets
See if this affects your attack surface
