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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| 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
- RHSA-2026:46885 vendor-advisory
- RHSA-2026:47388 vendor-advisory
- RHSA-2026:47735 vendor-advisory
- RHSA-2026:47949 vendor-advisory
- RHSA-2026:47953 vendor-advisory
- RHSA-2026:47974 vendor-advisory
- RHSA-2026:48284 vendor-advisory
- https://access.redhat.com/security/cve/CVE-2026-17107 vdb-entry
- RHBZ#2506771 issue-tracking