{"id":"CVE-2026-121966","published":"2026-11-04T16:17:50.107","lastModified":"2026-11-04T19:17:38.370","description":"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.","cvssScore":8.7,"cvssSeverity":"HIGH","cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N","cwes":["CWE-488"],"vendors":[],"products":[],"references":[{"url":"https://github.com/traefik/traefik/security/advisories/GHSA-hrpp-p4fc-wwf8","tags":[]},{"url":"https://www.vulncheck.com/advisories/traefik-before-2.11.60-and-3.7.16-forwardauth-ntlm-negotiate-identity-leak","tags":[]}],"exploitRefs":[{"url":"https://github.com/traefik/traefik/security/advisories/GHSA-hrpp-p4fc-wwf8","tags":[]}],"hasPoc":true,"ai":null}