CVE-2026-17107 | A flaw was found in the cluster-proxy service-proxy componen… | CVSS 8.5 HIGH

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.

Metadata

CVE ID: CVE-2026-17107
State: PUBLISHED
Assigner: redhat
Reserved: 2026-07-24 15:28 UTC
Published: 2026-07-24 18:56 UTC
Last updated: 2026-07-24 18:56 UTC
Primary CWE: CWE-441
Unintended Proxy or Intermediary ('Confused Deputy')
Vendor / Product: Red Hat / Multicluster Engine for Kubernetes
Sources: cve.org · NVD

Severity & Metrics

8.5 HIGH CVSS 3.1

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

Affected products (1)

Vendor	Product	Platform	Versions
Red Hat	Multicluster Engine for Kubernetes	—	—

Weakness (CWE)

CWE	Source	Description
CWE-441	cna	Unintended Proxy or Intermediary ('Confused Deputy')

CVSS scores (1)

Score	Severity	Version	Source	Vector
8.5	HIGH	3.1	cna	CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H

References (2)