GitHub Advisoryadvisory · Go

GHSA-q4gv-pjmh-c735 Open Cluster Management (OCM): Cross-cluster privilege escalation via improper Kubernetes client certificate renewal validation

HIGH Published 2026-04-07 Modified 2026-04-08 Official page ↗
Aliases
CVE-2026-4740
Ecosystem
Go
Packages
open-cluster-management.io/ocm
Severity
High
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
Weaknesses
CWE-295
Reviewed
2026-04-08

Affected packages

• Go open-cluster-management.io/ocm: < 1.2.1 → fixed in 1.2.1

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.

Related

Alias · CVE (1)

  • CVE-2026-4740 A flaw was found in Open Cluster Management (OCM), the technology underlying Red Hat Advanced Cluster Management (ACM). vulnerability

Weakness · CWE (1)

  • CWE-295 Improper Certificate Validation weakness

References