CVE-2026-4740
Published:April 07, 2026
Updated:April 25, 2026
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 Packages
https://github.com/open-cluster-management-io/ocm.git (GITHUB):
Affected version(s) >=v0.11.0 <1.2.1Fix Suggestion:
Update to version 1.2.1open-cluster-management.io/ocm (GO):
Affected version(s) >=v0.0.0-20230606095507-6f21760b7e57 <v1.2.1Fix Suggestion:
Update to version v1.2.1Related Resources (7)
Do you need more information?
Contact UsCVSS v4
Base Score:
9.3
Attack Vector
LOCAL
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
HIGH
User Interaction
NONE
Vulnerable System Confidentiality
HIGH
Vulnerable System Integrity
HIGH
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
HIGH
Subsequent System Integrity
HIGH
Subsequent System Availability
HIGH
CVSS v3
Base Score:
8.2
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
HIGH
User Interaction
NONE
Scope
CHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Weakness Type (CWE)
Improper Certificate Validation
EPSS
Base Score:
0.01
