A flaw was found in the cluster-proxy service-proxy component used in Red Hat Advanced Cluster Management for Kubernetes (RHACM) and… (CVE-2026-17107)
A vulnerability exists in the cluster-proxy service-proxy component used by Red Hat Advanced Cluster Management for Kubernetes (RHACM) and multicluster-engine (MCE). The flaw allows an authenticated hub principal to escalate privileges to cluster-admin on every managed cluster by injecting an Impersonate-Group header. This occurs because the service-proxy appends impersonation group headers without removing caller-supplied values, and the spoke ServiceAccount has unrestricted impersonation permissions.
AI Analysis
Technical Summary
CVE-2026-17107 is a privilege escalation vulnerability in the cluster-proxy service-proxy component of Red Hat Advanced Cluster Management for Kubernetes and multicluster-engine. The service-proxy incorrectly appends impersonation group headers to proxied requests without sanitizing or removing those supplied by the caller. Since the spoke ServiceAccount holds unrestricted impersonation permissions, an authenticated hub principal can exploit this flaw by injecting an Impersonate-Group header, thereby escalating privileges to cluster-admin on all managed clusters.
Potential Impact
An authenticated user on the hub cluster can escalate their privileges to cluster-admin on all managed clusters, potentially leading to full control over those clusters. This includes complete confidentiality, integrity, and availability impact on the affected Kubernetes clusters.
Mitigation Recommendations
Patch status is not yet confirmed — check the Red Hat advisory at https://access.redhat.com/security/cve/CVE-2026-17107 for current remediation guidance. Until an official fix is available, restrict access to the hub cluster to trusted principals only and monitor for suspicious impersonation header usage. Avoid granting unrestricted impersonation permissions to the spoke ServiceAccount if possible.
A flaw was found in the cluster-proxy service-proxy component used in Red Hat Advanced Cluster Management for Kubernetes (RHACM) and… (CVE-2026-17107)
Description
A vulnerability exists in the cluster-proxy service-proxy component used by Red Hat Advanced Cluster Management for Kubernetes (RHACM) and multicluster-engine (MCE). The flaw allows an authenticated hub principal to escalate privileges to cluster-admin on every managed cluster by injecting an Impersonate-Group header. This occurs because the service-proxy appends impersonation group headers without removing caller-supplied values, and the spoke ServiceAccount has unrestricted impersonation permissions.
CVSS v3.1
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-17107 is a privilege escalation vulnerability in the cluster-proxy service-proxy component of Red Hat Advanced Cluster Management for Kubernetes and multicluster-engine. The service-proxy incorrectly appends impersonation group headers to proxied requests without sanitizing or removing those supplied by the caller. Since the spoke ServiceAccount holds unrestricted impersonation permissions, an authenticated hub principal can exploit this flaw by injecting an Impersonate-Group header, thereby escalating privileges to cluster-admin on all managed clusters.
Potential Impact
An authenticated user on the hub cluster can escalate their privileges to cluster-admin on all managed clusters, potentially leading to full control over those clusters. This includes complete confidentiality, integrity, and availability impact on the affected Kubernetes clusters.
Mitigation Recommendations
Patch status is not yet confirmed — check the Red Hat advisory at https://access.redhat.com/security/cve/CVE-2026-17107 for current remediation guidance. Until an official fix is available, restrict access to the hub cluster to trusted principals only and monitor for suspicious impersonation header usage. Avoid granting unrestricted impersonation permissions to the spoke ServiceAccount if possible.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-vr7g-637m-v9mm
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-17107"]
- Ecosystems
- []
- Database Specific Severity
- HIGH
- Cvss Version
- 3.1
Threat ID: 6a6542289c2644c7f8089ff3
Added to database: 07/25/2026, 23:09:28 UTC
Last enriched: 07/25/2026, 23:54:00 UTC
Last updated: 07/26/2026, 04:51:53 UTC
Views: 7
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