{"id":"EUVD-2026-75584","revision":"ed5e7c0339b845e3ba97cd55cd49ed1f","records":[{"revision":"ed5e7c0339b845e3ba97cd55cd49ed1f","observedAt":"2026-10-30T12:52:24.17+00:00","statement":{"source":"euvd","id":"EUVD-2026-75584","aliases":["CVE-2026-88011","GHSA-rf44-j88r-hh8c"],"title":"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 bec…","description":"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.","state":0,"publishedAt":null,"modifiedAt":null,"affected":[],"metrics":[{"system":"EUVD CVSS 4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N","score":5.3,"severity":null}],"references":["https://github.com/traefik/traefik/security/advisories/GHSA-rf44-j88r-hh8c","https://github.com/traefik/traefik/pull/13720","https://github.com/traefik/traefik/commit/0331801c72329e0eaeb850e53ccce87c57fbecf8","https://github.com/traefik/traefik/releases/tag/v2.11.56","https://github.com/traefik/traefik/releases/tag/v3.7.12"],"sourceUrl":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-75584","license":"ENISA EUVD · source terms and attribution apply","enrichment":{"sourceStatus":null,"weaknesses":[],"productCriteria":[],"sourceDates":{"datePublished":"Sep 10, 2026, 3:31:55 PM","dateUpdated":"Sep 15, 2026, 2:42:22 PM"},"relatedAdvisories":[],"note":"EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON."},"key":"euvd:EUVD-2026-75584","identifiers":["EUVD-2026-75584","CVE-2026-88011","GHSA-rf44-j88r-hh8c"]},"retained":false,"historicalAffected":[]}],"coverage":[]}