{"id":"CVE-2021-33557","aliases":["GHSA-52cx-vphc-jmjm"],"url":"https://o3.security/vulnerability/CVE-2021-33557","summary":"MantisBT allows XSS in manage_custom_field_edit_page.php","details":"An XSS issue was discovered in manage_custom_field_edit_page.php in MantisBT before 2.25.2. Unescaped output of the return parameter allows an attacker to inject code into a hidden input field.","published":"2021-06-17T19:15:07.967Z","modified":"2026-08-07T17:02:12.847148Z","cvss":{"score":6.1,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"},"epss":{"score":0.01825,"percentile":0.76832,"asOf":"2026-08-23"},"cisaKev":null,"exploitsKnown":1,"affectedPackages":[{"ecosystem":"Packagist","name":"mantisbt/mantisbt","fixedVersion":"2.25.2"}],"fix":{"url":"https://github.com/mantisbt/mantisbt/commit/03dd37221e636f8959b8cb9fbad84f38f9582356","label":"mantisbt/mantisbt@03dd372"},"references":[{"type":"ADVISORY","url":"https://mantisbt.org/blog/archives/mantisbt/699"},{"type":"EVIDENCE","url":"https://mantisbt.org/bugs/view.php?id=28552"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2021-33557"},{"type":"WEB","url":"https://github.com/mantisbt/mantisbt/commit/03dd37221e636f8959b8cb9fbad84f38f9582356"},{"type":"PACKAGE","url":"https://github.com/mantisbt/mantisbt"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-07T17:02:12.847148Z"}}