{"id":"EUVD-2026-38558","revision":"ab6964abe5f441339fe3258c19146bbd","records":[{"revision":"ab6964abe5f441339fe3258c19146bbd","observedAt":"2026-11-01T09:14:51.361+00:00","statement":{"source":"euvd","id":"EUVD-2026-38558","aliases":["CVE-2026-52845","GHSA-f59h-q822-g45g"],"title":"Caddy is an extensible server platform that uses TLS by default. Prior to 2.11.4, forward_auth copy_headers deletes the exact client-supplied identity header before copying the trusted value from the auth gateway. But when the request later…","description":"Caddy is an extensible server platform that uses TLS by default. Prior to 2.11.4, forward_auth copy_headers deletes the exact client-supplied identity header before copying the trusted value from the auth gateway. But when the request later goes through php_fastcgi, Caddy normalizes HTTP headers into CGI variables by replacing - with _. This lets a client send an underscore alias that survives the forward_auth delete step but becomes the same PHP/FastCGI variable. Result: a remote client can inject or sometimes override identity/group headers trusted by PHP/FastCGI applications behind Caddy. This vulnerability is fixed in 2.11.4.","state":0,"publishedAt":null,"modifiedAt":null,"affected":[],"metrics":[{"system":"EUVD CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N","score":8.1,"severity":null}],"references":["https://github.com/caddyserver/caddy/security/advisories/GHSA-f59h-q822-g45g"],"sourceUrl":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-38558","license":"ENISA EUVD · source terms and attribution apply","enrichment":{"sourceStatus":null,"weaknesses":[],"productCriteria":[],"sourceDates":{"datePublished":"Jun 23, 2026, 5:52:01 PM","dateUpdated":"Jul 15, 2026, 12:46:09 AM"},"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-2026-38558","identifiers":["EUVD-2026-38558","CVE-2026-52845","GHSA-f59h-q822-g45g"]},"retained":false,"historicalAffected":[]}],"coverage":[]}