{"id":"GHSA-ghc5-95c2-vwcv","aliases":[],"url":"https://o3.security/vulnerability/GHSA-ghc5-95c2-vwcv","summary":"Auth0 Symfony SDK has Insufficient Entropy in Cookie Encryption","details":"### Impact\nIn applications built with the Auth0 PHP SDK, cookies are encrypted with insufficient entropy, which may result in threat actors brute-forcing the encryption key and forging session cookies.\n\n### Am I Affected?\nConsumers are affected if their application meets the following preconditions:\n- It uses the Auth0 Symfony SDK, versions between 5.0.0 and 5.7.0\n- Auth0 Symfony SDK using the Auth0-PHP SDK versions between 8.0.0 to 8.18.0.\n\n### Resolution\nUpgrade Auth0/symfony-auth0 to version 5.8.0 or greater.","published":"2026-04-03T03:44:13Z","modified":"2026-04-03T04:05:14.160135Z","cvss":{"score":8.2,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Packagist","name":"auth0/symfony","fixedVersion":"5.8.0"}],"fix":null,"references":[{"type":"WEB","url":"https://github.com/auth0/symfony/security/advisories/GHSA-ghc5-95c2-vwcv"},{"type":"PACKAGE","url":"https://github.com/auth0/symfony"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-04-03T04:05:14.160135Z"}}