CVE-2026-35051

high

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

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

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

https://github.com/traefik/traefik/releases/tag/v3.6.14

https://github.com/traefik/traefik/releases/tag/v2.11.43

Details

Source: Mitre, NVD

Published: 2026-04-30

Updated: 2026-05-01

Risk Information

CVSS v2

Base Score: 9.4

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:N

Severity: High

CVSS v3

Base Score: 10

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N

Severity: Critical

CVSS v4

Base Score: 7.8

Vector: 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

Severity: High

EPSS

EPSS: 0.0001