CVE-2026-4740
Published: Apr 7, 2026
Modified: May 28, 2026
CVSS v3.1
8.2
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.
| Vendor | Product | Versions |
|---|---|---|
Red Hat | Multicluster Engine for Kubernetes | All versions |
Red Hat | Multicluster Engine for Kubernetes | All versions |
Red Hat | Multicluster Engine for Kubernetes | All versions |
Red Hat | Multicluster Engine for Kubernetes | All versions |
Red Hat | Multicluster Engine for Kubernetes | All versions |
Red Hat | Multicluster Engine for Kubernetes | All versions |
Weaknesses (CWE)
CVSS v3.1 Details
CVSS v3.1 Vector
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability
References
Security Training
Train your team to recognize and prevent security threats with our comprehensive security awareness program.
Start TrainingVulnerability Scanning
Discover vulnerabilities in your applications and infrastructure before attackers do.
Scan Now