VDB
CVE-2026-4740
CVE-2026-4740
PUBLISHED
CVSS 8.199999809265137 HIGH
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.
EPSS 0.15% · 4.0th percentile
Risk Scores
CVSS 3.1
8.199999809265137
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
EPSS Score
0.15%
4.0th percentile
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Red Hat | Multicluster Engine for Kubernetes | |
| Red Hat | Multicluster Engine for Kubernetes |
Timeline
- Apr 7, 2026 CVE Published
- Apr 7, 2026 PoC Published
- Apr 7, 2026 Security Advisory
- Apr 8, 2026 EPSS Score
- May 18, 2026 EPSS Score
- May 19, 2026 EPSS Score
- May 20, 2026 EPSS Score
- May 21, 2026 EPSS Score
- May 22, 2026 EPSS Score
- May 23, 2026 EPSS Score
- May 24, 2026 EPSS Score
- May 25, 2026 EPSS Score