CVE-2026-17107

HIGH

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.

CVSS v3.1 Score

8.5
HIGH
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
Attack Vector
NETWORK
Complexity
HIGH
Privileges
LOW
User Interaction
NONE
Scope
CHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Published: 7/24/2026Modified: 8/2/2026

Related Intelligence (1)

HIGHVulnerability

NVD HIGH: CVE-2026-17107 — A flaw was found in the cluster-proxy service-proxy component used in Red Hat Ad...

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

CVE-2026-17107
NIST NVD

References (9)

https://access.redhat.com/errata/RHSA-2026:46885https://access.redhat.com/errata/RHSA-2026:47388https://access.redhat.com/errata/RHSA-2026:47735https://access.redhat.com/errata/RHSA-2026:47949https://access.redhat.com/errata/RHSA-2026:47953https://access.redhat.com/errata/RHSA-2026:47974https://access.redhat.com/errata/RHSA-2026:48284https://access.redhat.com/security/cve/CVE-2026-17107https://bugzilla.redhat.com/show_bug.cgi?id=2506771