CVE-2026-4740
High
Description
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.
SeverityHigh
CVSS8.2
Exploit probability—
Product
Redhat Advanced Cluster Management For Kubernetes
PublishedApr 7, 2026
First seenApr 7, 2026
Weakness typeCWE-295CWE-295
How to fix
Update
- open-cluster-management.io/ocm1.2.1 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| redhat advanced_cluster_management_for_kubernetes | No range specified | — |
| open-cluster-management.io/ocmGo | v < 1.2.1 | 1.2.1 |
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