Vulnerability in Red Hat Multicluster Engine For Kubernetes
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.
EPSS: 0.003 (27.6th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 8.5 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H.
Affected products
- Red Hat Multicluster Engine For Kubernetes
- Red Hat Multicluster Engine For Kubernetes 2.1 — versions 1784342329
- Red Hat Multicluster Engine For Kubernetes 2.10 — versions 1784342329
- Red Hat Multicluster Engine For Kubernetes 2.11 — versions 1784925025
- Red Hat Multicluster Engine For Kubernetes 2.11.0 — versions 1784925025
- Red Hat Multicluster Engine For Kubernetes 2.17 — versions 1784926298
- Red Hat Multicluster Engine For Kubernetes 2.6 — versions 1783985960
- Red Hat Multicluster Engine For Kubernetes 2.8 — versions 1784342329
- Red Hat Multicluster Engine For Kubernetes 2.9 — versions 1783278220
- Red Hat Multicluster Engine For Kubernetes 2.9.0 — versions 1783278220
Weakness classification (CWE)
References
- secalert@redhat.com (x_refsource_REDHAT, vdb-entry)
- secalert@redhat.com (x_refsource_REDHAT, issue-tracking)
- secalert@redhat.com (x_refsource_REDHAT, vendor-advisory)
- secalert@redhat.com (x_refsource_REDHAT, vendor-advisory)
- secalert@redhat.com (x_refsource_REDHAT, vendor-advisory)
- secalert@redhat.com (x_refsource_REDHAT, vendor-advisory)
- secalert@redhat.com (x_refsource_REDHAT, vendor-advisory)
- secalert@redhat.com (x_refsource_REDHAT, vendor-advisory)
- secalert@redhat.com (x_refsource_REDHAT, vendor-advisory)
Frequently asked questions
- What is CVE-2026-17107?
- CVE-2026-17107 is a high-severity vulnerability in Red Hat Multicluster Engine For Kubernetes, classified under Unintended Proxy or Intermediary (Confused Deputy). CVSS score: 8.5/10. Published 2026-07-24.
- How severe is CVE-2026-17107?
- High severity. CVSS v3 base score is 8.5 out of 10.