{"id":"CVE-2020-13625","aliases":["BIT-phpmailer-2020-13625","GHSA-f7hx-fqxw-rvvj"],"url":"https://o3.security/vulnerability/CVE-2020-13625","summary":"Insufficient output escaping of attachment names in PHPMailer","details":"### Impact\nCWE-116: Incorrect output escaping.\n\nAn attachment added like this (note the double quote within the attachment name, which is entirely valid):\n\n    $mail->addAttachment('/tmp/attachment.tmp', 'filename.html\";.jpg');\n\nWill result in a message containing these headers:\n\n    Content-Type: application/octet-stream; name=\"filename.html\";.jpg\"\n    Content-Disposition: attachment; filename=\"filename.html\";.jpg\"\n\nThe attachment will be named `filename.html`, and the trailing `\";.jpg\"` will be ignored. Mail filters that reject `.html` attachments but permit `.jpg` attachments may be fooled by this.\n\nNote that the MIME type itself is obtained automatically from the *source filename* (in this case `attachment.tmp`, which maps to a generic `application/octet-stream` type), and not the *name* given to the attachment (though these are the same if a separate name is not provided), though it can be set explicitly in other parameters to attachment methods.\n\n### Patches\nPatched in PHPMailer 6.1.6 by escaping double quotes within the name using a backslash, as per RFC822 section 3.4.1, resulting in correctly escaped headers like this:\n\n    Content-Type: application/octet-stream; name=\"filename.html\\\";.jpg\"\n    Content-Disposition: attachment; filename=\"filename.html\\\";.jpg\"\n\n### Workarounds\nReject or filter names and filenames containing double quote (`\"`) characters before passing them to attachment functions such as `addAttachment()`.\n\n### References\n[CVE-2020-13625](https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2020-13625).\n[PHPMailer 6.1.6 release](https://github.com/PHPMailer/PHPMailer/releases/tag/v6.1.6)\n\n### For more information\nIf you have any questions or comments about this advisory:\n* Open an issue in [the PHPMailer repo](https://github.com/PHPMailer/PHPMailer/issues)","published":"2020-06-08T17:15:10.097Z","modified":"2026-10-20T10:51:47.646780312Z","cvss":{"score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":1,"affectedPackages":[{"ecosystem":"Packagist","name":"phpmailer/phpmailer","fixedVersion":"6.1.6"}],"fix":{"url":"https://github.com/PHPMailer/PHPMailer/commit/c2796cb1cb99d7717290b48c4e6f32cb6c60b7b3","label":"PHPMailer/PHPMailer@c2796cb"},"references":[{"type":"WEB","url":"http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00067.html"},{"type":"WEB","url":"http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00085.html"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/EFM3BZABL6RUHTVMXSC7OFMP4CKWMRPJ/"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SMH4TC5XTS3KZVGMSKEPPBZ2XTZCKKCX/"},{"type":"ADVISORY","url":"https://github.com/PHPMailer/PHPMailer/releases/tag/v6.1.6"},{"type":"ADVISORY","url":"https://lists.debian.org/debian-lts-announce/2020/06/msg00014.html"},{"type":"ADVISORY","url":"https://lists.debian.org/debian-lts-announce/2020/08/msg00004.html"},{"type":"ADVISORY","url":"https://usn.ubuntu.com/4505-1/"},{"type":"FIX","url":"https://github.com/PHPMailer/PHPMailer/security/advisories/GHSA-f7hx-fqxw-rvvj"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2020-13625"},{"type":"WEB","url":"https://github.com/PHPMailer/PHPMailer/commit/c2796cb1cb99d7717290b48c4e6f32cb6c60b7b3"},{"type":"PACKAGE","url":"https://github.com/PHPMailer/PHPMailer"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/EFM3BZABL6RUHTVMXSC7OFMP4CKWMRPJ"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/SMH4TC5XTS3KZVGMSKEPPBZ2XTZCKKCX"},{"type":"WEB","url":"https://usn.ubuntu.com/4505-1"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-10-20T10:51:47.646780312Z"}}