Vulnerability Description
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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Traefik | Traefik | < 2.11.51 |
Related Weaknesses (CWE)
References
- https://github.com/traefik/traefik/commit/7ae92d8c2c10ac04ef5a03df0ed5019ce0f44bPatch
- https://github.com/traefik/traefik/pull/13344Issue Tracking
- https://github.com/traefik/traefik/security/advisories/GHSA-3q9r-p662-5j8mPatchVendor Advisory
FAQ
What is CVE-2026-54764?
CVE-2026-54764 is a vulnerability with a CVSS score of 5.8 (MEDIUM). 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-Forward...
How severe is CVE-2026-54764?
CVE-2026-54764 has been rated MEDIUM with a CVSS base score of 5.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-54764?
Check the references section above for vendor advisories and patch information. Affected products include: Traefik Traefik.