High severity8.5NVD Advisory· Published Jul 24, 2026· Updated Sep 7, 2026
CVE-2026-17107
CVE-2026-17107
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.
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Affected products
2Patches
Vulnerability mechanics
References
9- access.redhat.com/errata/RHSA-2026:46885nvd
- access.redhat.com/errata/RHSA-2026:47388nvd
- access.redhat.com/errata/RHSA-2026:47735nvd
- access.redhat.com/errata/RHSA-2026:47949nvd
- access.redhat.com/errata/RHSA-2026:47953nvd
- access.redhat.com/errata/RHSA-2026:47974nvd
- access.redhat.com/errata/RHSA-2026:48284nvd
- access.redhat.com/security/cve/CVE-2026-17107nvd
- bugzilla.redhat.com/show_bug.cginvd
News mentions
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