CVE-2026-88011 : faille élevée traefik traefik (CVSS 8.1)

Traefik is an open source HTTP reverse proxy and load balancer. Prior to 2.11.56, and from 3.0.0 until 3.7.12, a client-supplied dot-form header such as X.Authenticated.User survives ForwardAuth replacement and underscoreHeadersStrategy because Go treats it as distinct from X-Authenticated-User while normalization-prone CGI, WSGI, PHP, and NGINX backends collapse both names. A backend can consequently consume the client value instead of the identity Traefik asserted, allowing identity spoofing for any header managed by Traefik. The aliasHeadersStrategy protection is disabled by default and must be configured as delete or reject. The mitigation is available in 2.11.56 and 3.7.12.

Sévérité

Élevée (CVSS 8.1)

Vecteur CVSS

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

Exploitation active

Non signalée par la CISA

Publication

10 sept. 2026

Dernière mise à jour

15 sept. 2026

• traefik traefik

• Fiche CVE-2026-88011 sur le NVD (NIST)
• github.com/traefik/traefik/commit/0331801c72329e0eaeb850e…
• github.com/traefik/traefik/pull/13720
• github.com/traefik/traefik/releases/tag/v2.11.56
• github.com/traefik/traefik/releases/tag/v3.7.12
• github.com/traefik/traefik/security/advisories/GHSA…