{"id":"GHSA-ghc5-95c2-vwcv","aliases":[],"status":"published","title":"Auth0 Symfony SDK has Insufficient Entropy in Cookie Encryption","description":"### 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.","severity":{"version":"3.1","score":8.2,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N","level":"high","from":"ghsa"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-331"],"published":"2026-04-03T03:44:13Z","modified":"2026-04-03T04:05:14Z","fixes":[{"ecosystem":"Packagist","package":"auth0/symfony","fixed_in":["5.8.0"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"Packagist","package":"auth0/symfony","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"5.0.0"},{"last_affected":"5.7.0"},{"fixed":"5.8.0"}]}]},{"source":"osv","ecosystem":"Packagist","package":"auth0/symfony","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"5.0.0"},{"fixed":"5.8.0"}]}],"versions":["5.0.0","5.1.0","5.2.0","5.2.1","5.2.2","5.2.3","5.3.0","5.3.1","5.4.0","5.4.1","5.5.0","5.6.0","5.7.0"]}],"references":[{"url":"https://github.com/auth0/symfony/security/advisories/GHSA-ghc5-95c2-vwcv","tags":["web"]},{"url":"https://github.com/advisories/GHSA-ghc5-95c2-vwcv"},{"url":"https://github.com/auth0/symfony","tags":["package"]}],"sources":{"ghsa":[{"id":"GHSA-ghc5-95c2-vwcv","title":"Auth0 Symfony SDK has Insufficient Entropy in Cookie Encryption","description":"### 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.","status":"published","published":"2026-04-03T03:44:13Z","modified":"2026-04-03T03:44:13Z","cvss":[{"version":"3.1","score":8.2,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N","level":"high"}],"cwes":["CWE-331"],"updated_at":"2026-11-02T14:39:47.945242Z"}],"osv":[{"id":"GHSA-ghc5-95c2-vwcv","title":"Auth0 Symfony SDK has Insufficient Entropy in Cookie Encryption","description":"### 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.","status":"published","published":"2026-04-03T03:44:13Z","modified":"2026-04-03T04:05:14.160135Z","cvss":[{"version":"3.1","score":8.2,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N","level":"high"}],"cwes":["CWE-331"],"updated_at":"2026-11-02T15:46:47.822182Z"}]}}