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.
History

Mon, 27 Jul 2026 23:30:00 +0000

Type Values Removed Values Added
CPEs cpe:/a:redhat:multicluster_engine cpe:/a:redhat:multicluster_engine:2.10::el9
References

Mon, 27 Jul 2026 20:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Sat, 25 Jul 2026 00:15:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

threat_severity

Important


Fri, 24 Jul 2026 19:15:00 +0000

Type Values Removed Values Added
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.
Title Cluster-proxy: cluster-proxy: impersonation header injection in service-proxy grants cluster-admin on every managed cluster
First Time appeared Redhat
Redhat multicluster Engine
Weaknesses CWE-441
CPEs cpe:/a:redhat:multicluster_engine
Vendors & Products Redhat
Redhat multicluster Engine
References
Metrics cvssV3_1

{'score': 8.5, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H'}


cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published: 2026-07-24T18:56:05.194Z

Updated: 2026-07-27T22:41:14.800Z

Reserved: 2026-07-24T15:28:38.469Z

Link: CVE-2026-17107

cve-icon Vulnrichment

Updated: 2026-07-27T17:21:02.744Z

cve-icon NVD

No data.

cve-icon Redhat

Severity : Important

Publid Date: 2026-07-24T18:49:48Z

Links: CVE-2026-17107 - Bugzilla