{"id":"EM-20261104-9DBX","url":"https://cyber.eventmonitor.net/incident/EM-20261104-9DBX/traefik-vulnerability-cve-2026-121966/","type":"cve","title":"Traefik Vulnerability (CVE-2026-121966)","subtitle":"CVE-2026-121966","subject":"CVE-2026-121966","status":"Developing","severity":"high","affected":[],"headline":null,"born":"2026-11-04T16:17:50.107Z","firstSignal":"2026-11-04T15:33:28.000Z","lastSignal":"2026-11-04T16:17:50.107Z","updated":"2026-11-07T00:59:45.971Z","revision":1,"life":[{"status":"Born","at":"2026-11-04T16:17:50.107Z","why":"second independent source: C6 NVD CVE API 2.0"},{"status":"Developing","at":"2026-11-04T16:17:50.107Z","why":"signals keep joining"}],"changeLog":[{"at":"2026-11-04T15:33:28.000Z","what":"First signal: C41 Red Hat Security Data"},{"at":"2026-11-04T16:17:50.107Z","what":"Born: second source, C6 NVD CVE API 2.0. Page EM-20261104-9DBX created."}],"stages":[{"name":"Disclosed","at":"2026-11-04T16:17:50.107Z","detail":"C6 NVD published"},{"name":"Scored","at":"2026-11-04T16:17:50.107Z","detail":"CVSS 7 · EPSS 0.3%"},{"name":"Exploited","at":null,"detail":"No exploitation reported"},{"name":"Advisories","at":null,"detail":"None yet"},{"name":"Vendor Response","at":"2026-11-04T15:33:28.000Z","detail":"C41 published"},{"name":"Resolved","at":null,"detail":"After 14 quiet days"}],"signals":[{"at":"2026-11-04T15:33:28.000Z","source":"C41","sourceName":"Red Hat Security Data","role":"Vendor","severity":3,"title":"Red Hat: CVE-2026-121966 (important)","text":"github.com/traefik/traefik: Traefik: Unauthorized access via shared authentication connection pool","url":"https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-121966.json"},{"at":"2026-11-04T16:17:50.107Z","source":"C6","sourceName":"NVD CVE API 2.0","role":"Database","severity":3,"title":"CVE-2026-121966 (CVSS 7)","text":"Traefik 2.x before 2.11.60 and 3.x before 3.7.16 sends ForwardAuth subrequests (and, in 3.7, Ingress NGINX auth-url requests) through an auth-server connection pool shared by all clients, exposing connection-bound NTLM or Negotiate authentication. An unauthenticated attacker can reuse another user's authenticated connection, receiving the victim's identity via authResponseHeaders to access backends as that user.","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-121966"}],"crowd":[],"reference":{"nvd":{"published":"2026-11-04T16:17:50.107","score":7,"severity":"HIGH","desc":"Traefik 2.x before 2.11.60 and 3.x before 3.7.16 sends ForwardAuth subrequests (and, in 3.7, Ingress NGINX auth-url requests) through an auth-server connection pool shared by all clients, exposing connection-bound NTLM or Negotiate authentication. An unauthenticated attacker can reuse another…","product":"","seen":1793830001890},"kev":null,"epss":{"epss":0.00333,"pct":0.26805,"at":1794013185971},"p0":false},"mergedInto":null,"publisher":"Event Monitor Cyber"}