{"id":"CVE-2016-2403","aliases":["GHSA-wvj5-r78r-hhfq"],"url":"https://o3.security/vulnerability/CVE-2016-2403","summary":"Symfony Authentication Bypass","details":"Symfony before 2.8.6 and 3.x before 3.0.6 allows remote attackers to bypass authentication by logging in with an empty password and valid username, which triggers an unauthenticated bind.","published":"2017-02-07T17:59:00.303Z","modified":"2026-08-07T14:49:07.641883Z","cvss":{"score":9.8,"severity":"CRITICAL","vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Packagist","name":"symfony/security-core","fixedVersion":"2.8.6"},{"ecosystem":"Packagist","name":"symfony/security-core","fixedVersion":"3.0.6"},{"ecosystem":"Packagist","name":"symfony/security","fixedVersion":"2.8.6"},{"ecosystem":"Packagist","name":"symfony/security","fixedVersion":"3.0.6"},{"ecosystem":"Packagist","name":"symfony/symfony","fixedVersion":"2.8.6"},{"ecosystem":"Packagist","name":"symfony/symfony","fixedVersion":"3.0.6"}],"fix":null,"references":[{"type":"ADVISORY","url":"http://symfony.com/blog/cve-2016-2403-unauthorized-access-on-a-misconfigured-ldap-server-when-using-an-empty-password"},{"type":"ADVISORY","url":"http://www.securityfocus.com/bid/96137"},{"type":"ADVISORY","url":"https://www.debian.org/security/2018/dsa-4262"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-07T14:49:07.641883Z"}}