Vulnerabilities CVE-2026-4740

CVE-2026-4740

High

Open

TLP:CLEAR

Rhacm: open cluster management (ocm): cross-cluster privilege escalation via improper kubernetes client certificate renewal validation

NVD CVE.org

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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.

Details

CVSS Score: 8.2
EPSS Score ⓘ: 0.15%

4.6th percentile
CVSS Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
Confidence: 90%
Published: Apr 7, 2026
Last Modified: Aug 12, 2026

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