Is CVE-2026-4740 actively exploited?

CVE-2026-4740 has no public evidence of in-the-wild exploitation as of 2026-04-28.

What is the CVSS score for CVE-2026-4740?

CVE-2026-4740 has a CVSS score of 8.2 (HIGH severity). Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H.

How do I patch CVE-2026-4740?

Patch guidance is available from redhat security advisories. CVEDatabase generates AI-assisted remediation guidance on demand for CVE-2026-4740.

Which products are affected by CVE-2026-4740?

1 product: redhat advanced cluster management for kubernetes.

Fix CVE-2026-4740 - HIGH | CVEDatabase.com

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.

CVSS Metrics

Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
Attack Vector: local
Complexity: low
Privileges: high
User Action: none
Scope: changed
Confidentiality: high
Integrity: high
Availability: high
Weaknesses: CWE-295

Metadata

Primary Vendor: REDHAT
Published: 4/7/2026
Last Modified: 4/28/2026
Source: NIST NVD
Note: Verify all details with official vendor sources before applying patches.

CVE-2026-4740

Description

CVSS Metrics

Metadata

Affected Products

Remediation Guidance

Executive Summary