CVE-2026-17107

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 3.1

8.5CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H

EPSS

0.6% chance of exploitation in the next 30 days; higher than 46% of CVEs (scores of 2026-10-25)

CWE

CWE-441

Published

2026-07-24

Modified

2026-09-29

Record from

the NVD, synced 2026-10-19

References

• https://access.redhat.com/errata/RHSA-2026:46885
• https://access.redhat.com/errata/RHSA-2026:47388
• https://access.redhat.com/errata/RHSA-2026:47735
• https://access.redhat.com/errata/RHSA-2026:47949
• https://access.redhat.com/errata/RHSA-2026:47953

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