Vulnerability Details CVE-2026-4740
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.0
EPSS Ranking 0.7%
CVSS Severity
CVSS v3 Score 8.2
References
Products affected by CVE-2026-4740
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cpe:2.3:a:redhat:advanced_cluster_management_for_kubernetes:-