{"id":"CVE-2026-17107","title":"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)","summary":"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 wit…","severity":"high","cvss":8.5,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H","cwe":["CWE-441"],"vendor":"Red Hat","product":"multicluster-engine/cluster-proxy-rhel9","affected":["multicluster-engine/cluster-proxy-rhel9 (all versions)","multicluster-engine/cluster-proxy-rhel9 (all versions)","multicluster-engine/cluster-proxy-rhel9 (all versions)","multicluster-engine/cluster-proxy-rhel9 (all versions)","multicluster-engine/cluster-proxy-rhel9 (all versions)","multicluster-engine/cluster-proxy-rhel9 (all versions)","multicluster-engine/cluster-proxy-rhel9 (all versions)"],"published":"2026-07-24","updated":"2026-09-08","sourceUpdated":"2026-09-08T13:17:18.123","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-17107","references":[{"url":"https://access.redhat.com/errata/RHSA-2026:46885","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:47388","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:47735","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:47949","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:47953","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:47974","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:48284","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/security/cve/CVE-2026-17107","label":"secalert@redhat.com"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2506771","label":"secalert@redhat.com"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-17107.json"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-17107"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-17107"}],"tags":["nvd","cve.org","csaf","vex","red-hat"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-07-27T17:20:52.949389Z"},"epss":0.00568,"epssPercentile":0.44654,"ingestedAt":"2026-08-02T12:18:23.889Z","patched":["multicluster_engine_for_kubernetes 2.11","multicluster_engine_for_kubernetes 2.17","multicluster_engine_for_kubernetes 2.1","multicluster_engine_for_kubernetes 2.6","multicluster_engine_for_kubernetes 2.8","multicluster_engine_for_kubernetes 2.9"],"slug":"CVE-2026-17107","body":"## Overview\n\nA 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **RHSA-2026:47974** · Red Hat · fixed in: multicluster engine for Kubernetes 2.11 · released 2026-07-29 · [advisory](https://access.redhat.com/errata/RHSA-2026:47974)\n- **RHSA-2026:48284** · Red Hat · fixed in: multicluster engine for Kubernetes 2.17 · released 2026-07-29 · [advisory](https://access.redhat.com/errata/RHSA-2026:48284)\n- **RHSA-2026:46885** · Red Hat · fixed in: multicluster engine for Kubernetes 2.1 · released 2026-07-27 · [advisory](https://access.redhat.com/errata/RHSA-2026:46885)\n- **RHSA-2026:47949** · Red Hat · fixed in: multicluster engine for Kubernetes 2.6 · released 2026-07-29 · [advisory](https://access.redhat.com/errata/RHSA-2026:47949)\n- **RHSA-2026:47735** · Red Hat · fixed in: multicluster engine for Kubernetes 2.8 · released 2026-07-29 · [advisory](https://access.redhat.com/errata/RHSA-2026:47735)\n- **RHSA-2026:47953** · Red Hat · fixed in: multicluster engine for Kubernetes 2.9 · released 2026-07-29 · [advisory](https://access.redhat.com/errata/RHSA-2026:47953)","depth":"twilight","depthScore":47,"depthScoreParts":{"impact":46.8,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}