---
id: CVE-2026-17107
title: >-
  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)
summary: >-
  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 wit…
severity: high
cvss: 8.5
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H'
cwe:
  - CWE-441
vendor: Red Hat
product: multicluster-engine/cluster-proxy-rhel9
affected:
  - multicluster-engine/cluster-proxy-rhel9 (all versions)
  - multicluster-engine/cluster-proxy-rhel9 (all versions)
  - multicluster-engine/cluster-proxy-rhel9 (all versions)
  - multicluster-engine/cluster-proxy-rhel9 (all versions)
  - multicluster-engine/cluster-proxy-rhel9 (all versions)
  - multicluster-engine/cluster-proxy-rhel9 (all versions)
  - multicluster-engine/cluster-proxy-rhel9 (all versions)
published: '2026-07-24'
updated: '2026-09-08'
sourceUpdated: '2026-09-08T13:17:18.123'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-17107'
references:
  - url: 'https://access.redhat.com/errata/RHSA-2026:46885'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:47388'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:47735'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:47949'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:47953'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:47974'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:48284'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/security/cve/CVE-2026-17107'
    label: secalert@redhat.com
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2506771'
    label: secalert@redhat.com
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-17107.json
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-17107'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-17107'
tags:
  - nvd
  - cve.org
  - csaf
  - vex
  - red-hat
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-07-27T17:20:52.949389Z'
epss: 0.00568
epssPercentile: 0.44832
ingestedAt: '2026-08-02T12:18:23.889Z'
patched:
  - multicluster_engine_for_kubernetes 2.11
  - multicluster_engine_for_kubernetes 2.17
  - multicluster_engine_for_kubernetes 2.1
  - multicluster_engine_for_kubernetes 2.6
  - multicluster_engine_for_kubernetes 2.8
  - multicluster_engine_for_kubernetes 2.9
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Vendor advisories

- **RHSA-2026:47974** · Red Hat · fixed in: multicluster engine for Kubernetes 2.11 · released 2026-07-29 · [advisory](https://access.redhat.com/errata/RHSA-2026:47974)
- **RHSA-2026:48284** · Red Hat · fixed in: multicluster engine for Kubernetes 2.17 · released 2026-07-29 · [advisory](https://access.redhat.com/errata/RHSA-2026:48284)
- **RHSA-2026:46885** · Red Hat · fixed in: multicluster engine for Kubernetes 2.1 · released 2026-07-27 · [advisory](https://access.redhat.com/errata/RHSA-2026:46885)
- **RHSA-2026:47949** · Red Hat · fixed in: multicluster engine for Kubernetes 2.6 · released 2026-07-29 · [advisory](https://access.redhat.com/errata/RHSA-2026:47949)
- **RHSA-2026:47735** · Red Hat · fixed in: multicluster engine for Kubernetes 2.8 · released 2026-07-29 · [advisory](https://access.redhat.com/errata/RHSA-2026:47735)
- **RHSA-2026:47953** · Red Hat · fixed in: multicluster engine for Kubernetes 2.9 · released 2026-07-29 · [advisory](https://access.redhat.com/errata/RHSA-2026:47953)