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Vulnerability · Published Apr 30, 2026 · Assigned by GitHub_M

CVE-2026-35051Traefik: ForwardAuth trustForwardHeader=false allows spoofed X-Forwarded-Prefix to bypass auth

High 8.2

In plain English

A high-severity insufficient verification of data authenticity in traefik from traefik. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 19% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)8.2High
Exploit odds (30 days)0.3%top 81.0% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Gogithub.com/traefik/traefikno fix listedGHSA-6384-m2mw-rf54
Gogithub.com/traefik/traefikno fix listedGO-2026-5163
Gogithub.com/traefik/traefik/v22.11.43GHSA-6384-m2mw-rf54
Gogithub.com/traefik/traefik/v22.11.43GO-2026-5163
Gogithub.com/traefik/traefik/v33.7.0-rc.2GHSA-6384-m2mw-rf54
Gogithub.com/traefik/traefik/v33.6.14, 3.7.0-rc.2GO-2026-5163
Gogithub.com/traefik/traefik/v33.6.14GHSA-6384-m2mw-rf54

Affected products (as reported)

VendorProductVersions
traefik traefik < 2.11.43>= 3.0.0-beta1, < 3.6.14>= 3.7.0-ea.1, < 3.7.0-rc.2

Weakness: CWE-345, CWE-501 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N

References