CVE-2026-35051
CRITICALTraefik: ForwardAuth trustForwardHeader=false allows spoofed X-Forwarded-Prefix to bypass auth
Title source: cnaDescription
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)
Core 4
Core References
X_Refsource_Confirm x_refsource_confirm
https://github.com/traefik/traefik/security/advisories/GHSA-6384-m2mw-rf54
X_Refsource_Misc x_refsource_misc
https://github.com/traefik/traefik/releases/tag/v2.11.43
X_Refsource_Misc x_refsource_misc
https://github.com/traefik/traefik/releases/tag/v3.6.14
X_Refsource_Misc x_refsource_misc
https://github.com/traefik/traefik/releases/tag/v3.7.0-rc.2
Scores
CVSS v3
10.0
EPSS
0.0026
EPSS Percentile
16.6%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
yes
Technical Impact
total
Details
CWE
CWE-345
Status
published
Products (8)
traefik/traefik
3.7.0 ea1 (4 CPE variants)
traefik/traefik
< 2.11.43 (2 CPE variants)
traefik/traefik
0 - 1.7.34Go
traefik/traefik
0 - 2.11.43Go
traefik/traefik
3.0.0-beta1 - 3.6.14Go
traefik/traefik
3.7.0-ea.1 - 3.7.0-rc.2Go
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