CVE-2026-4740

HIGH

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.

CVE Details

CVSS v3.1 Score8.2

SeverityHIGH

CVSS VectorCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

Attack VectorLOCAL

ComplexityLOW

Privileges RequiredHIGH

User InteractionNONE

Published4/7/2026

Last Modified4/7/2026

Sourcenvd

Honeypot Sightings0

Weaknesses (CWE)

CWE-295

References

https://access.redhat.com/security/cve/CVE-2026-4740(secalert@redhat.com)

https://blog.arfevrier.fr/open-cluster-management-cross-cluster-escape/(secalert@redhat.com)

https://bugzilla.redhat.com/show_bug.cgi?id=2450590(secalert@redhat.com)

IOC Correlations

No correlations recorded

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