{"id":"GHSA-9wg9-93h9-j8ch","aliases":[],"url":"https://o3.security/vulnerability/GHSA-9wg9-93h9-j8ch","summary":"Auth0 Symfony SDK Vulnerable to Brute Force Authentication Tags of CookieStore Sessions","details":"**Overview**\nSession cookies of applications using the Auth0 symfony SDK configured with CookieStore have authentication tags that can be brute forced, which may result in unauthorized access.\n\n**Am I Affected?**\nYou are affected by this vulnerability if you meet the following pre-conditions:\n1. Applications using the Auth0 symfony SDK with version <=5.3.1\n2. Auth0/Symfony SDK uses the Auth0-PHP SDK with version 8.0.0-BETA1 or higher and below 8.14.0. \n3. Session storage configured with CookieStore.\n\n\n**Fix**\nUpgrade Auth0/symfony to v5.4.0. As an additional precautionary measure, we recommend rotating your cookie encryption keys. Note that once updated, any previous session cookies will be rejected.\n\n**Acknowledgement**\nOkta would like to thank Félix Charette for discovering this vulnerability.","published":"2025-05-17T15:06:54Z","modified":"2026-02-05T14:17:42.152332Z","cvss":{"score":9.1,"severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Packagist","name":"auth0/symfony","fixedVersion":"5.4.0"}],"fix":{"url":"https://github.com/auth0/symfony/commit/9a7294f08a32f17a0e77c8522a648195b6940340","label":"auth0/symfony@9a7294f"},"references":[{"type":"WEB","url":"https://github.com/auth0/symfony/security/advisories/GHSA-9wg9-93h9-j8ch"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-47275"},{"type":"WEB","url":"https://github.com/auth0/symfony/commit/9a7294f08a32f17a0e77c8522a648195b6940340"},{"type":"PACKAGE","url":"https://github.com/auth0/symfony"},{"type":"WEB","url":"https://github.com/auth0/symfony/releases/tag/5.4.0"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-02-05T14:17:42.152332Z"}}