{"id":"CVE-2021-3603","state":"PUBLISHED","title":"Inclusion of Functionality from Untrusted Control Sphere in PHPMailer/PHPMailer","description":"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.","publishedAt":"2021-06-17T12:09:42.000Z","updatedAt":"2024-08-03T17:01:07.074Z","severity":{"score":8.1,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","source":"@huntrdev"},"assigner":"@huntrdev","products":["PHPMailer PHPMailer"],"affected":[{"vendor":"PHPMailer","product":"PHPMailer","versions":[{"version":"unspecified","status":"affected","lessThan":"6.5.0","versionType":"custom"}]}],"references":["https://www.huntr.dev/bounties/1-PHPMailer/PHPMailer/","https://github.com/PHPMailer/PHPMailer/commit/45f3c18dc6a2de1cb1bf49b9b249a9ee36a5f7f3","https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FJYSOFCUBS67J3TKR74SD3C454N7VTYM/","https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3YRMWGA4VTMXFB22KICMB7YMFZNFV3EJ/"],"weaknesses":["CWE-829"],"ingestedAt":"2026-10-29T19:48:55.807Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2021/3xxx/CVE-2021-3603.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.1","cveMetadata":{"cveId":"CVE-2021-3603","state":"PUBLISHED","datePublished":"2021-06-17T12:09:42.000Z","dateUpdated":"2024-08-03T17:01:07.074Z","assignerShortName":"@huntrdev","assignerOrgId":"c09c270a-b464-47c1-9133-acb35b22c19a","dateReserved":"2021-06-15T00:00:00.000Z"},"containers":{"cna":{"title":"Inclusion of Functionality from Untrusted Control Sphere in PHPMailer/PHPMailer","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"PHPMailer","product":"PHPMailer","versions":[{"version":"unspecified","status":"affected","lessThan":"6.5.0","versionType":"custom"}]}],"references":[{"url":"https://www.huntr.dev/bounties/1-PHPMailer/PHPMailer/","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/PHPMailer/PHPMailer/commit/45f3c18dc6a2de1cb1bf49b9b249a9ee36a5f7f3","tags":["x_refsource_MISC"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FJYSOFCUBS67J3TKR74SD3C454N7VTYM/","name":"FEDORA-2021-bfc34b3d5c","tags":["vendor-advisory","x_refsource_FEDORA"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3YRMWGA4VTMXFB22KICMB7YMFZNFV3EJ/","name":"FEDORA-2021-ef548cb234","tags":["vendor-advisory","x_refsource_FEDORA"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":8.1,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-829","description":"CWE-829 Inclusion of Functionality from Untrusted Control Sphere","lang":"en","type":"CWE"}]}],"providerMetadata":{"shortName":"@huntrdev","dateUpdated":"2021-06-26T02:06:18.000Z","orgId":"c09c270a-b464-47c1-9133-acb35b22c19a"},"source":{"advisory":"1-PHPMailer/PHPMailer","discovery":"EXTERNAL"},"x_generator":{"engine":"Vulnogram 0.0.9"},"x_legacyV4Record":{"CVE_data_meta":{"ASSIGNER":"security@huntr.dev","ID":"CVE-2021-3603","STATE":"PUBLIC","TITLE":"Inclusion of Functionality from Untrusted Control Sphere in PHPMailer/PHPMailer"},"affects":{"vendor":{"vendor_data":[{"product":{"product_data":[{"product_name":"PHPMailer","version":{"version_data":[{"version_affected":"<","version_value":"6.5.0"}]}}]},"vendor_name":"PHPMailer"}]}},"data_format":"MITRE","data_type":"CVE","data_version":"4.0","description":{"description_data":[{"lang":"eng","value":"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). 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