CVE-2026-17107

HIGH

Cluster-proxy: cluster-proxy: impersonation header injection in service-proxy grants cluster-admin on every managed cluster

Title source: cna

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.

References (2)

Core 2

Core References

Vdb Entry, X_Refsource_Redhat vdb-entry x_refsource_redhat

https://access.redhat.com/security/cve/CVE-2026-17107

Issue Tracking, X_Refsource_Redhat issue-tracking x_refsource_redhat

RHBZ#2506771

https://bugzilla.redhat.com/show_bug.cgi?id=2506771

Scores

CVSS v3 8.5

EPSS 0.0023

EPSS Percentile 13.5%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H

Details

CWE

CWE-441

Status published

Products (1)

Red Hat/Multicluster Engine for Kubernetes

Published Jul 24, 2026

Tracked Since Jul 25, 2026