Vulnerabilities CVE-2026-17107

CVE-2026-17107

High

Open

TLP:CLEAR

Cluster-proxy: cluster-proxy: impersonation header injection in service-proxy grants cluster-admin on every managed cluster

NVD CVE.org

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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.

Details

CVSS Score: 8.5
EPSS Score ⓘ: 0.35%

27.7th percentile
CVSS Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
Confidence: 90%
Published: Jul 24, 2026
Last Modified: Aug 16, 2026

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