Dashboard / CVE-2026-121966

CVE-2026-121966

HIGH
MEDIUM Priority: 0.02 BB Relevance: 74/100
Published: 2026-11-04 Modified: 2026-11-04 First seen: 2026-11-04 Status: active

Attack Surface

Network Low Complexity No Auth No Interaction

CVSS Vector Breakdown

AV: Network
AC: Low
PR: None
UI: None
S: X
AT: Present
VC: None
VI: None
VA: None

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.

Weakness Classification (1)

Affected Software (4)

VendorProductVersion
traefik traefik 0 < 2.11.60
traefik traefik 3.0.0 < 3.7.16
traefik traefik 0 < 2.11.60
traefik traefik 3.0.0 < 3.7.16

References & Advisories (2)

Bug Bounty Relevance

74 / 100
✓ Network accessible
✓ No authentication
✓ Low complexity
✓ No user interaction

CVSS Score

7.0 / 10.0 v4.0
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS — Exploitation Probability

0.33%
Raw Score 0.003330
Percentile 27.1%
Date 2026-11-14

EPSS Trend

2026-11-14
0.00333
2026-11-13
0.00333
2026-11-12
0.00333
2026-11-10
0.00333
2026-11-09
0.00333
2026-11-08
0.00333
2026-11-07
0.00333
2026-11-06
0.00333
2026-11-05
0.00333

Intelligence Sources

mitre ref →
nvd ref →

External Links