CVE-2026-17107
Cluster-proxy: cluster-proxy: impersonation header injection in service-proxy grants cluster-admin on every managed cluster
CVSS Score
8.5
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-441 |
| Vendor | red hat |
| Product | multicluster engine for kubernetes |
| Published | Jul 24, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H Attack Vector
Network
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High
Affected Versions
Red Hat / Multicluster Engine for Kubernetes
All versions affected References
Credits
Red Hat would like to thank Arpit Jain and Kahiro Okina (Craftsman Software, Inc.) for reporting this issue.