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.
- CVSS 3.1
- 8.2
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H - EPSS
- 0.1% chance of exploitation in the next 30 days; higher than 4% of CVEs (scores of 2026-10-26)
- CWE
- CWE-295
- Published
- Modified
- Record from
- the NVD, synced
Affected
- redhat:advanced_cluster_management_for_kubernetes
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-q4gv-pjmh-c735 | Go | open-cluster-management.io/ocm | <1.2.1 | 1.2.1 |
| GO-2026-5564 | Go | open-cluster-management.io/ocm | <1.2.1 | 1.2.1 |