CVE-2026-4740

high Red Hat
CVSS v3 Base Score
8.2
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
Attack Characteristics
Attack Vector
Local
Attack Complexity
Low
Privileges Required
High
User Interaction
None
Confidentiality
High
Integrity
High
Availability
High
Published: April 7, 2026 (37 days ago)
Last Modified: April 7, 2026
Vendor: Red Hat
Source: REDHAT

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.

CWE

CWE-295

Affected Products

Multicluster Engine for Kubernetes

References

🔗 bugzilla.redhat.com 🔗 www.cve.org 🔗 nvd.nist.gov 🔗 blog.arfevrier.fr