CVE-2026-17107
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
Summary
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.
Affected Software
| Vendor | Product | Version Range | Status |
|---|
Weaknesses
- CWE-441: Unintended Proxy or Intermediary ('Confused Deputy')
Workarounds
Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
References
- https://access.redhat.com/security/cve/CVE-2026-17107
- https://bugzilla.redhat.com/show_bug.cgi?id=2506771
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