{"id":"UBUNTU-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.","modified":"2026-01-31T10:11:56.938654Z","published":"2021-06-17T12:15:00Z","related":["USN-5956-1"],"upstream":["CVE-2021-3603"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2021-3603"},{"type":"REPORT","url":"https://www.huntr.dev/bounties/1-PHPMailer/PHPMailer/"},{"type":"REPORT","url":"https://github.com/PHPMailer/PHPMailer/commit/45f3c18dc6a2de1cb1bf49b9b249a9ee36a5f7f3"},{"type":"REPORT","url":"https://github.com/PHPMailer/PHPMailer/commit/45f3c18dc6a2de1cb1bf49b9b249a9ee36a5f7f3"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-5956-1"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2021-3603"}],"affected":[{"package":{"name":"libphp-phpmailer","ecosystem":"Ubuntu:Pro:20.04:LTS","purl":"pkg:deb/ubuntu/libphp-phpmailer@6.0.6-0.1ubuntu0.1~esm1?arch=source&distro=esm-apps/focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.0.6-0.1ubuntu0.1~esm1"}]}],"versions":["6.0.6-0.1"],"ecosystem_specific":{"binaries":[{"binary_version":"6.0.6-0.1ubuntu0.1~esm1","binary_name":"libphp-phpmailer"}],"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-3603.json"}},{"package":{"name":"libphp-phpmailer","ecosystem":"Ubuntu:Pro:22.04:LTS","purl":"pkg:deb/ubuntu/libphp-phpmailer@6.2.0-2ubuntu0.1~esm1?arch=source&distro=esm-apps/jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.2.0-2ubuntu0.1~esm1"}]}],"versions":["6.2.0-2"],"ecosystem_specific":{"binaries":[{"binary_version":"6.2.0-2ubuntu0.1~esm1","binary_name":"libphp-phpmailer"}],"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-3603.json"}}],"schema_version":"1.7.3","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H"},{"type":"Ubuntu","score":"medium"}]}