CVE-2026-121966

HighCVSS 8.7/10Last modified Nov 4, 2026

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.

Metrics

CVSS 3.1 8.7/10CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N

Weakness enumeration

CWE-488

Affected software

Source: the vendor's advisory (CNA). NVD analysis pending.

Vendor	Product	Versions
traefik	traefik	< 2.11.60
traefik	traefik	>= 3.0.0, < 3.7.16

References

Timeline

Published: Nov 4, 2026
Last modified: Nov 4, 2026
NVD status: Awaiting Analysis

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