Bugzilla – Bug 1270432
VUL-0: CVE-2026-54764: traefik,traefik2: ForwardAuth middleware leaks X-Forwarded-Port
Last modified: 2026-07-10 09:32:05 UTC
Traefik is an HTTP reverse proxy and load balancer. Prior to v2.11.51, v3.6.22, and v3.7.6, Traefik's ForwardAuth middleware, even when configured with trustForwardHeader: false, derives the X-Forwarded-Port header sent to the authentication service from the original incoming request instead of the sanitized forwarded request. As a result, an unauthenticated remote attacker can inject an X-Forwarded-Proto: https header over a plain HTTP connection and cause Traefik to forward X-Forwarded-Port: 443 to the authentication service, bypassing port-based authorization checks. This issue is fixed in versions v2.11.51, v3.6.22, and v3.7.6. References: http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2026-54764 https://www.cve.org/CVERecord?id=CVE-2026-54764 https://github.com/traefik/traefik/commit/7ae92d8c2c10ac04ef5a03df0ed5019ce0f44b2d https://github.com/traefik/traefik/pull/13344 https://github.com/traefik/traefik/security/advisories/GHSA-3q9r-p662-5j8m
Fixed with versions 2.11.51 and version 3.7.6 just accepted in the development project