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Vulnerability · Published Jul 24, 2026 · Assigned by redhat

CVE-2026-17107Cluster-proxy: impersonation-header injection grants cluster-admin on every managed cluster

High 8.5

In plain English

A high-severity security flaw in multicluster engine for Kubernetes 2.10 from Red Hat. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 47% of all known vulnerabilities).

Severity (CVSS 3.1)8.5High
Exploit odds (30 days)0.6%top 52.7% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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 (as reported)

VendorProductVersions
Red Hat multicluster engine for Kubernetes 2.10 see references
Red Hat multicluster engine for Kubernetes 2.10 see references
Red Hat multicluster engine for Kubernetes 2.11 see references
Red Hat multicluster engine for Kubernetes 2.17 see references
Red Hat multicluster engine for Kubernetes 2.6 see references
Red Hat multicluster engine for Kubernetes 2.8 see references
Red Hat multicluster engine for Kubernetes 2.9 see references

Weakness: CWE-441 · Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H

References