Bug 2450590 (CVE-2026-4740) - CVE-2026-4740 rhacm: Open Cluster Management (OCM): Cross-cluster privilege escalation via improper Kubernetes client certificate renewal validation
Summary: CVE-2026-4740 rhacm: Open Cluster Management (OCM): Cross-cluster privilege e...
Keywords:
Status: NEW
Alias: CVE-2026-4740
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-03-24 03:25 UTC by OSIDB Bzimport
Modified: 2026-04-07 14:01 UTC (History)
6 users (show)

Fixed In Version:
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Description OSIDB Bzimport 2026-03-24 03:25:48 UTC 
Improper validation of Kubernetes client certificate renewal in Open Cluster Management (OCM), the technology underlying Red Hat Advanced Cluster Management (ACM), allows a managed cluster administrator to forge a client certificate that can be approved by the OCM controller.

Due to predictable cluster name prefix matching, this enables cross-cluster privilege escalation and may allow an attacker to gain control over other managed clusters (including the hub cluster).
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