Cross-site scripting (XSS) vulnerability in manage_custom_field_edit_page.php in MantisBT 1.2.19 and earlier allows remote attackers to inject arbitrary web script or HTML via the return parameter.
https://github.com/mantisbt/mantisbt/commit/5068df2dcf79c34741c746c9b27e0083f2a374da
https://github.com/mantisbt/mantisbt/commit/11ab3d6c82a1d3a89b1024f77349fb60a83743c5