CVE-2026-17107
Cluster-proxy: impersonation-header injection grants cluster-admin on every managed cluster
- State
- Published
- Severity
- 8.5 High
- Published
- Jul 24, 2026
- Updated
- Sep 29, 2026
- Reserved
- Jul 24, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 8.5 High | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H | redhat |
Weaknesses
- CWE-441 Unintended Proxy or Intermediary ('Confused Deputy')
Affected Products
| Product | Versions |
|---|---|
multicluster engine for Kubernetes 2.10Red Hat |
|
multicluster engine for Kubernetes 2.10Red Hat |
|
multicluster engine for Kubernetes 2.11Red Hat |
|
multicluster engine for Kubernetes 2.17Red Hat |
|
multicluster engine for Kubernetes 2.6Red Hat |
|
multicluster engine for Kubernetes 2.8Red Hat |
|
multicluster engine for Kubernetes 2.9Red Hat |
|
References
- RHSA-2026:46885vendor-advisory
- RHSA-2026:47388vendor-advisory
- RHSA-2026:47735vendor-advisory
- RHSA-2026:47949vendor-advisory
- RHSA-2026:47953vendor-advisory
- RHSA-2026:47974vendor-advisory
- RHSA-2026:48284vendor-advisory
- https://access.redhat.com/security/cve/CVE-2026-17107vdb-entry
- RHBZ#2506771issue-tracking
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