CVE-2026-17107

Multicluster Engine for KubernetesVulnerabilityCVSS 8.5

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.

No public exploitation has been reported so far. No distribution fix is listed yet; apply vendor mitigations and monitor.

Recommended action: Track your distribution's security tracker and apply the fix as soon as it ships.

CVE-2026-17107 Multicluster Engine for Kubernetes Vulnerability

Severity metrics

CVSS 3.1 : 8.5 HIGH

Attack vectorNetwork (remote)

Attack complexityHigh

Privileges requiredLow

User interactionNone

ScopeChanged

Confidentiality impactHigh

Integrity impactHigh

Availability impactHigh

Vector: AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H

Affected & fixed versions by distribution

Versions are the native distribution strings (backport-aware): RHEL/Debian/SUSE backport fixes, so compare with the distro version comparator (dpkg / rpm / vercmp), not the upstream version.

No affected package in the tracked watchlist yet (Debian, Ubuntu, Arch, SUSE, Red Hat...). Triage may still be pending.

Sources

Advisory NVD CVE.org

Published 2026-07-24 · updated 2026-07-25 · source: NVD