CVE-2026-17107

HighCVSS 8.5/10Last modified Sep 29, 2026

Description

A flaw was found in the cluster-proxy service-proxy component used in Red Hat Advanced Cluster Management for Kubernetes (RHACM) and multicluster-engine (MCE). The service-proxy appends impersonation group headers to proxied requests without first removing caller-supplied values, and the spoke ServiceAccount holds unrestricted impersonation permissions. An authenticated hub principal can inject an Impersonate-Group header to escalate to cluster-admin on every managed cluster.

Metrics

CVSS 3.1 8.5/10CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H

Weakness enumeration

CWE-441

Affected software

Source: the vendor's advisory (CNA). NVD analysis pending.

Vendor	Product	Versions
Red Hat	multicluster engine for Kubernetes 2.10	—
Red Hat	multicluster engine for Kubernetes 2.10	—
Red Hat	multicluster engine for Kubernetes 2.11	—
Red Hat	multicluster engine for Kubernetes 2.17	—
Red Hat	multicluster engine for Kubernetes 2.6	—
Red Hat	multicluster engine for Kubernetes 2.8	—
Red Hat	multicluster engine for Kubernetes 2.9	—

References

Timeline

Published: Jul 24, 2026
Last modified: Sep 29, 2026
NVD status: Awaiting Analysis

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