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HIGHCVE-2026-35051Published Modified CNA GitHub_M

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

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.

Metrics

CVSS v4.0
7.8
Severity
HIGH
Fixed in
—
Affected Products
1
Affected packages
  • traefik / traefik
    < 2.11.43 · >= 3.0.0-beta1, < 3.6.14 · >= 3.7.0-ea.1, < 3.7.0-rc.2
CVSS 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
References