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CVE-2026-17107

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

Published: Jul 24, 2026Updated: Jul 24, 2026 Sources: CVE List NVDCWE-441
8.5HIGH
NVD MITRE
EPSS Score
0.2%
Top 86.5%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Workaround Only
Self-Check
Not available

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:HPR:LUI:NS:CC:HI:HA:H
Exploitability
AV:NAttack Vector
Network
AC:HAttack Complexity
High
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:CScope
Changed
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
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Weaknesses

CWE-441

Affected Products

Red Hat
commercial·US
Multicluster Engine for KubernetesOn-premWeb App
Cloud & SaaS / container-orchestration

Exploitability

Workaround Available
Is your org exposed to CVE-2026-17107?We can run the check for you — a free external exposure review, no install. Check my exposure

References

https://access.redhat.com/security/cve/CVE-2026-17107
access.redhat.com
https://bugzilla.redhat.com/show_bug.cgi?id=2506771
bugzilla.redhat.com

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