{"id":"GHSA-98j6-67v3-mw34","aliases":[],"url":"https://o3.security/vulnerability/GHSA-98j6-67v3-mw34","summary":"Auth0 Symfony SDK Deserialization of Untrusted Data vulnerability","details":"**Overview**\nThe Auth0 Symfony SDK contains a critical vulnerability due to insecure deserialization of cookie data. If exploited, since SDKs process cookie content without prior authentication, a threat actor could send a specially crafted cookie containing malicious serialized data.\n\n\n**Am I Affected?**\nYou are affected by this vulnerability if you meet the following preconditions:\n\n1. Applications using the Auth0 Symfony SDK, versions between 5.0.0 BETA-0 to 5.0.0. \n2. Auth0 Symfony SDK uses the Auth0-PHP SDK with version 8.0.0-BETA3 to 8.3.0.\n\n**Fix**\nUpgrade Auth0/symfony to the latest version (v5.4.0).\n\n**Acknowledgement**\nOkta would like to thank Andreas Forsblom for discovering this vulnerability.","published":"2025-06-06T00:07:08Z","modified":"2026-02-04T03:30:57.828093Z","cvss":null,"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Packagist","name":"auth0/symfony","fixedVersion":"5.1.0"}],"fix":null,"references":[{"type":"WEB","url":"https://github.com/auth0/auth0-PHP/security/advisories/GHSA-v9m8-9xxp-q492"},{"type":"WEB","url":"https://github.com/auth0/laravel-auth0/security/advisories/GHSA-c42h-56wx-h85q"},{"type":"WEB","url":"https://github.com/auth0/symfony/security/advisories/GHSA-98j6-67v3-mw34"},{"type":"WEB","url":"https://github.com/auth0/wordpress/security/advisories/GHSA-862m-5253-832r"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-48951"},{"type":"PACKAGE","url":"https://github.com/auth0/symfony"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-02-04T03:30:57.828093Z"}}