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CVE-2026-4740— Rhacm: open cluster management (ocm): cross-cluster privilege escalation via improper kubernetes client certificate renewal validation

CVSS 8.2 · High EPSS 0.01% · P1
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I. Basic Information for CVE-2026-4740

Vulnerability Information
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Vulnerability Title
Rhacm: open cluster management (ocm): cross-cluster privilege escalation via improper kubernetes client certificate renewal validation
Source: NVD (National Vulnerability Database)
Vulnerability 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.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
证书验证不恰当
Source: NVD (National Vulnerability Database)
Vulnerability Title
Red Hat rhacm2 信任管理问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Red Hat rhacm2是美国红帽（Red Hat）公司的一个库。 Red Hat rhacm2存在信任管理问题漏洞，该漏洞源于Kubernetes客户端证书续订验证不当，可能导致受管集群管理员伪造可被OCM控制器批准的客户端证书，从而实现跨集群权限提升并控制其他受管集群。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
Red HatMulticluster Engine for Kubernetes-cpe:/a:redhat:multicluster_engine
Red HatMulticluster Engine for Kubernetes-cpe:/a:redhat:multicluster_engine

II. Public POCs for CVE-2026-4740

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III. Intelligence Information for CVE-2026-4740

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Same Patch Batch · Red Hat · 2026-04-07 · 4 CVEs total

CVE-2026-46319.8 CRITICALCockpit: cockpit: unauthenticated remote code execution due to ssh command-line argument i
CVE-2025-148217.8 HIGHLibssh: libssh: insecure default configuration leads to local man-in-the-middle attacks on
CVE-2026-57455.5 MEDIUMLibarchive: a null pointer dereference vulnerability exists in the acl parser of libarchiv

IV. Related Vulnerabilities

Same product: Multicluster Engine for Kubernetes
Same vendor: Red Hat
Same weakness: CWE-295

V. Comments for CVE-2026-4740

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