What is CVE-2026-4740?

CVE-2026-4740 is a high-severity vulnerability in Red Hat Multicluster Engine For Kubernetes, classified under Improper Certificate Validation. CVSS score: 8.2/10. Published 2026-04-07.

How severe is CVE-2026-4740?

High severity. CVSS v3 base score is 8.2 out of 10.

Vulnerability in Red Hat Multicluster Engine For Kubernetes

CVE-2026-4740

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 c…

Vulnerability class: Improper Certificate Validation

EPSS: 0.000 (1.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.2 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H.

Affected products

Weakness classification (CWE)

CWE-295 — Improper Certificate Validation

References

secalert@redhat.com (x_refsource_REDHAT, vdb-entry, Vendor Advisory)
secalert@redhat.com (Exploit, Third Party Advisory)
RHBZ#2450590 (x_refsource_REDHAT, issue-tracking, Issue Tracking, Vendor Advisory)

Frequently asked questions

What is CVE-2026-4740?: CVE-2026-4740 is a high-severity vulnerability in Red Hat Multicluster Engine For Kubernetes, classified under Improper Certificate Validation. CVSS score: 8.2/10. Published 2026-04-07.
How severe is CVE-2026-4740?: High severity. CVSS v3 base score is 8.2 out of 10.