HIGHCVSS v3.1 8.7Vulnerability
CVE-2026-121966
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.
Properties
- Severity
- HIGH
- Nvd fetched at
- 2026-11-04T17:37:42.865599+00:00
- Cvss severity
- HIGH
- Cvss score
- 8.7
- Retrieved at
- 2026-11-04T17:38:51+00:00
- Score
- 8.7
- Cvss version
- 3.1
- Last source
- NVD
- Cve id
- CVE-2026-121966
- Cvss vector
- CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N
- First seen by Signal
- 2026-11-04T17:38:51+00:00
- Vector
- CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N
- Published at
- 2026-11-04T16:17:50.107
- Last modified
- 2026-11-04T16:17:50.303
Related Entities (1)
HAS_WEAKNESS (1)
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