{"id":"CVE-2026-17107","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-17107","generatedAt":"2026-10-28T03:39:13.964Z","title":"An authenticated hub principal can inject an Impersonate-Group header to escalate to cluster-admin on every managed cluster.","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.","published":"2026-07-24T19:16:56.000Z","lastModified":"2026-09-29T19:17:26.000Z","status":"Awaiting Analysis","sourceIdentifier":"secalert@redhat.com","cvss":{"version":"3.1","score":8.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H"},"cwe":["CWE-441"],"affected":[],"epss":{"score":0.00568,"percentile":0.46883,"date":"2026-10-27","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (0.57%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[],"references":[{"url":"https://access.redhat.com/errata/RHSA-2026:46885","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:47388","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:47735","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:47949","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:47953","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:47974","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:48284","source":"secalert@redhat.com"},{"url":"https://access.redhat.com/security/cve/CVE-2026-17107","source":"secalert@redhat.com"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2506771","source":"secalert@redhat.com"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-17107","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}