VULNERABILITY INTELLIGENCE
CVE-2026-17107
CVSS score8.5 HIGH
EPSS probability0.57%
CISA KEVNot currently listed
Published2026-07-24
Last modified2026-09-29
CVSS vectorCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
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.
Weakness classification
- secalert@redhat.com: CWE-441