{"id":"GHSA-f7hx-fqxw-rvvj","aliases":["BIT-phpmailer-2020-13625","CVE-2020-13625"],"title":"Insufficient output escaping of attachment names in PHPMailer","titleSource":"OSV","descriptionSource":"OSV","declaredSeverity":"HIGH","description":"### 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)","severity":"high","score":7.5,"published":"2020-05-27T16:37:02.000Z","modified":"2026-07-08T05:59:55.175Z","withdrawn":false,"knownExploited":false,"affected":[{"ecosystem":"Packagist","name":"phpmailer/phpmailer","sources":[{"name":"OSV · GHSA-f7hx-fqxw-rvvj","url":"https://osv.dev/vulnerability/GHSA-f7hx-fqxw-rvvj"}],"ranges":[{"events":[{"introduced":"0"},{"fixed":"6.1.6"}],"type":"ECOSYSTEM"}],"versions":["v5.2.10","v5.2.11","v5.2.12","v5.2.13","v5.2.14","v5.2.15","v5.2.16","v5.2.17","v5.2.18","v5.2.19","v5.2.2","v5.2.20","v5.2.21","v5.2.22","v5.2.23","v5.2.24","v5.2.25","v5.2.26","v5.2.27","v5.2.28","v5.2.4","v5.2.5","v5.2.6","v5.2.7","v5.2.8","v5.2.9","v6.0.0","v6.0.0rc1","v6.0.0rc2","v6.0.0rc3","v6.0.0rc4","v6.0.0rc5","v6.0.1","v6.0.2","v6.0.3","v6.0.4","v6.0.5","v6.0.6","v6.0.7","v6.1.0","v6.1.1","v6.1.2","v6.1.3","v6.1.4","v6.1.5"],"fixed":["6.1.6"]}],"sourceAffected":[],"references":["https://github.com/PHPMailer/PHPMailer/security/advisories/GHSA-f7hx-fqxw-rvvj","https://nvd.nist.gov/vuln/detail/CVE-2020-13625","https://github.com/PHPMailer/PHPMailer/commit/c2796cb1cb99d7717290b48c4e6f32cb6c60b7b3","https://github.com/PHPMailer/PHPMailer","https://github.com/PHPMailer/PHPMailer/releases/tag/v6.1.6","https://lists.debian.org/debian-lts-announce/2020/06/msg00014.html","https://lists.debian.org/debian-lts-announce/2020/08/msg00004.html","https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/EFM3BZABL6RUHTVMXSC7OFMP4CKWMRPJ","https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/SMH4TC5XTS3KZVGMSKEPPBZ2XTZCKKCX","https://usn.ubuntu.com/4505-1","http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00067.html","http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00085.html"],"sources":[{"name":"OSV","id":"GHSA-f7hx-fqxw-rvvj","modified":"2026-07-08T05:59:55.175185807Z","url":"https://osv.dev/vulnerability/GHSA-f7hx-fqxw-rvvj"}],"assessments":[{"source":"OSV","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","score":7.5}],"products":[],"remediation":[],"kev":{"status":"not-listed","checkedAt":"2026-10-28T18:25:31.900Z"},"coverage":[{"source":"NVD","status":"not-checked"},{"source":"GHSA","status":"not-checked"},{"source":"EUVD","status":"not-checked"},{"source":"EPSS","status":"not-checked"}],"evidence":[]}