{"id":"CVE-2021-3603","details":"PHPMailer 6.4.1 and earlier contain a vulnerability that can result in untrusted code being called (if such code is injected into the host project's scope by other means). If the $patternselect parameter to validateAddress() is set to 'php' (the default, defined by PHPMailer::$validator), and the global namespace contains a function called php, it will be called in preference to the built-in validator of the same name. Mitigated in PHPMailer 6.5.0 by denying the use of simple strings as validator function names.","aliases":["BIT-phpmailer-2021-3603","GHSA-77mr-wc79-m8j3"],"modified":"2026-04-10T04:35:20.778393Z","published":"2021-06-17T12:15:08.150Z","related":["MGASA-2021-0345"],"references":[{"type":"WEB","url":"https://www.huntr.dev/bounties/1-PHPMailer/PHPMailer/"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3YRMWGA4VTMXFB22KICMB7YMFZNFV3EJ/"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FJYSOFCUBS67J3TKR74SD3C454N7VTYM/"},{"type":"FIX","url":"https://github.com/PHPMailer/PHPMailer/commit/45f3c18dc6a2de1cb1bf49b9b249a9ee36a5f7f3"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/phpmailer/phpmailer","events":[{"introduced":"0"},{"last_affected":"9256f12d8fb0cd0500f93b19e18c356906cbed3d"},{"fixed":"45f3c18dc6a2de1cb1bf49b9b249a9ee36a5f7f3"}],"database_specific":{"versions":[{"introduced":"0"},{"last_affected":"6.4.1"}]}}],"versions":["v2.2.1","v5.2.0","v5.2.1","v5.2.2","v5.2.4","v5.2.5","v5.2.6","v5.2.7","v5.2.8","v5.2.9","v6.0.7","v6.1.0","v6.1.1","v6.1.2","v6.1.3","v6.1.4","v6.1.5","v6.1.6","v6.1.7","v6.1.8","v6.2.0","v6.3.0","v6.4.0","v6.4.1"],"database_specific":{"unresolved_ranges":[{"events":[{"introduced":"0"},{"last_affected":"33"}]},{"events":[{"introduced":"0"},{"last_affected":"34"}]}],"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-3603.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H"}]}