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.

INFO

Published Date :

2026-04-07T14:30:36.396Z

Last Modified :

2026-04-09T14:40:43.580Z

Source :

redhat
AFFECTED PRODUCTS

The following products are affected by CVE-2026-4740 vulnerability.

Vendors Products
Redhat
  • Advanced Cluster Management For Kubernetes
  • Multicluster Engine
REFERENCES

Here, you will find a curated list of external links that provide in-depth information to CVE-2026-4740.

URL Resource
https://access.redhat.com/security/cve/CVE-2026-4740 cve-icon cve-icon
https://blog.arfevrier.fr/open-cluster-management-cross-cluster-escape/ cve-icon cve-icon cve-icon
https://bugzilla.redhat.com/show_bug.cgi?id=2450590 cve-icon cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2026-4740 cve-icon
https://www.cve.org/CVERecord?id=CVE-2026-4740 cve-icon
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CVSS Vulnerability Scoring System

Detailed values of each vector for above chart.
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact