High 8.5Published Jul 24, 2026

CVE-2026-17107Cluster-proxy: impersonation-header injection grants cluster-admin on every managed cluster

Updated under an hour ago (Oct 27, 2026, 10:00 PM ET)

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It affects Red Hat multicluster engine for Kubernetes 2.10. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for Red Hat multicluster engine for Kubernetes 2.10

Exploited in the last 30 days

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: 8.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
Weakness (CWE): CWE-441
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: redhat
NVD analysis: Awaiting Analysis
Record last updated: Sep 29, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Red Hat multicluster engine for Kubernetes 2.10 redhat:multicluster_engine	from 1784342329 not affected	CNA record

References

References

https://access.redhat.com/errata/RHSA-2026:46885	vendor-advisory, x-refsource-redhat
https://access.redhat.com/errata/RHSA-2026:47388	vendor-advisory, x-refsource-redhat
https://access.redhat.com/errata/RHSA-2026:47735	vendor-advisory, x-refsource-redhat
https://access.redhat.com/errata/RHSA-2026:47949	vendor-advisory, x-refsource-redhat
https://access.redhat.com/errata/RHSA-2026:47953	vendor-advisory, x-refsource-redhat
https://access.redhat.com/errata/RHSA-2026:47974	vendor-advisory, x-refsource-redhat
https://access.redhat.com/errata/RHSA-2026:48284	vendor-advisory, x-refsource-redhat
https://access.redhat.com/security/cve/CVE-2026-17107	vdb-entry, x-refsource-redhat
https://bugzilla.redhat.com/show_bug.cgi?id=2506771	issue-tracking, x-refsource-redhat

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.