CVE-2026-4740

Fixed in a distro release EPSS <1%CVSS 8.2

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.

Published 2026-04-07 · CVE record · OSV

Products: Red Hat multicluster engine for Kubernetes 2.1, Red Hat multicluster engine for Kubernetes 2.11, Red Hat multicluster engine for Kubernetes 2.6, Red Hat multicluster engine for Kubernetes 2.8, Red Hat multicluster engine for Kubernetes 2.9, Red Hat Multicluster Engine for Kubernetes

Fixed upstream

Distro releases