{"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":null,"cisaKev":null,"exploitsKnown":1,"affectedPackages":[{"ecosystem":"Packagist","name":"mantisbt/mantisbt","fixedVersion":"2.25.2"}],"fix":null,"references":[{"type":"ADVISORY","url":"https://mantisbt.org/blog/archives/mantisbt/699"},{"type":"EVIDENCE","url":"https://mantisbt.org/bugs/view.php?id=28552"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-07T17:02:12.847148Z"}}