{"id":"GHSA-98j6-67v3-mw34","aliases":[],"status":"published","title":"Auth0 Symfony SDK Deserialization of Untrusted Data vulnerability","description":"**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.","severity":{"version":"4.0","score":9.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:H/SI:H/SA:H","level":"critical","from":"ghsa"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-502"],"published":"2025-06-06T00:07:08Z","modified":"2026-02-04T03:30:57Z","fixes":[{"ecosystem":"Packagist","package":"auth0/symfony","fixed_in":["5.1.0"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"Packagist","package":"auth0/symfony","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"5.0.0-BETA0"},{"last_affected":"5.0.0"},{"fixed":"5.1.0"}]}]},{"source":"osv","ecosystem":"Packagist","package":"auth0/symfony","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"5.0.0-BETA0"},{"fixed":"5.1.0"}]}],"versions":["5.0.0","5.0.0-BETA0","5.0.0-BETA1"]}],"references":[{"url":"https://github.com/auth0/auth0-PHP/security/advisories/GHSA-v9m8-9xxp-q492","tags":["web"]},{"url":"https://github.com/auth0/laravel-auth0/security/advisories/GHSA-c42h-56wx-h85q","tags":["web"]},{"url":"https://github.com/auth0/symfony/security/advisories/GHSA-98j6-67v3-mw34","tags":["web"]},{"url":"https://github.com/auth0/wordpress/security/advisories/GHSA-862m-5253-832r","tags":["web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2025-48951","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-98j6-67v3-mw34"},{"url":"https://github.com/auth0/symfony","tags":["package"]}],"sources":{"ghsa":[{"id":"GHSA-98j6-67v3-mw34","title":"Auth0 Symfony SDK Deserialization of Untrusted Data vulnerability","description":"**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.","status":"published","published":"2025-06-06T00:07:08Z","modified":"2025-06-06T00:07:10Z","cvss":[{"version":"4.0","score":9.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:H/SI:H/SA:H","level":"critical"}],"cwes":["CWE-502"],"updated_at":"2026-11-02T14:38:45.948817Z"}],"osv":[{"id":"GHSA-98j6-67v3-mw34","title":"Auth0 Symfony SDK Deserialization of Untrusted Data vulnerability","description":"**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.","status":"published","published":"2025-06-06T00:07:08Z","modified":"2026-02-04T03:30:57.828093Z","cvss":[{"version":"4.0","score":9.3,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:H/SI:H/SA:H","level":"critical"}],"cwes":["CWE-502"],"updated_at":"2026-11-02T15:46:43.524801Z"}]}}