CVE-2026-4740HIGH 8.2EPSS p1.6%

CVE-2026-4740CVE-2026-4740

redhat / advanced_cluster_management_for_kubernetes

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.

Scoring

CVSS 3.18.2 (HIGH)
VectorCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
EPSS0.11% probability of exploitation · percentile 1.6% · 2026-08-02T12:03:13Z
Published2026-04-07
Last modified2026-07-15

Underlying weaknesses· 1

CWE-295

References

  1. https://access.redhat.com/security/cve/CVE-2026-4740
  2. https://blog.arfevrier.fr/open-cluster-management-cross-cluster-escape/
  3. https://bugzilla.redhat.com/show_bug.cgi?id=2450590

1

TypeTargetConfidenceTier
WeaknessImproper Certificate Validationcwe-2950%live

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