CVE-2026-35051

HIGH

Traefik: ForwardAuth trustForwardHeader=false allows spoofed X-Forwarded-Prefix to bypass auth

Title source: cna

Description

Traefik is an HTTP reverse proxy and load balancer. Prior to versions 2.11.43, 3.6.14, and 3.7.0-rc.2, there is an authentication bypass vulnerability in Traefik's ForwardAuth middleware when trustForwardHeader=false is configured and Traefik is deployed behind a trusted upstream proxy. This issue has been patched in versions 2.11.43, 3.6.14, and 3.7.0-rc.2.

References (4)

[X_Refsource_Confirm] https://github.com/traefik/traefik/security/advisories/GHSA-6384-m2mw-rf54

[X_Refsource_Misc] https://github.com/traefik/traefik/releases/tag/v2.11.43

[X_Refsource_Misc] https://github.com/traefik/traefik/releases/tag/v3.6.14

[X_Refsource_Misc] https://github.com/traefik/traefik/releases/tag/v3.7.0-rc.2

Scores

CVSS v4 7.8

EPSS 0.0001

EPSS Percentile 1.1%

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:L/SA:N

CISA SSVC

Vulnrichment

Exploitation none

Automatable yes

Technical Impact total

Details

CWE

CWE-345

Status published

Products (3)

traefik/traefik < 2.11.43

traefik/traefik >= 3.0.0-beta1, < 3.6.14

traefik/traefik >= 3.7.0-ea.1, < 3.7.0-rc.2

Published Apr 30, 2026

Tracked Since May 01, 2026