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.
- Affected products
- Kubernetes, Open Cluster Management
- Redhat Advanced Cluster Management For Kubernetes
- All versions
- CVSS 3.1
- 8.2 HIGH
- EPSS
- 0.1% (2th percentile)
- Weakness
- CWE-295
- NVD status
- Modified
- Published
- 2026-04-07
Workaround
Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
No indexed exploits for CVE-2026-4740 yet
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No exploit for CVE-2026-4740 has been indexed yet. Our index is built from live traffic and upstream syncs, so this page can only say what it knows — not that no exploit exists.