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EUVD-2026-277132

fkie_cve-2026-33517

Mantis Bug Tracker (MantisBT) is an open source issue tracker. In version 2.28.0, when deleting a Tag (tag_delete.php), improper escaping of its name when displaying the confirmation message allows an attacker to inject HTML and, if CSP settings permit, achieve execution of arbitrary JavaScript. Version 2.28.1 fixes the issue. Workarounds include reverting commit d6890320752ecf37bd74d11fe14fe7dc12335be9 and/or manually editing language files to remove the sprintf placeholder `%1$s` from `$s_tag_delete_message` string.

GHSA-fh48-f69w-7vmp — MantisBT Vulnerable to Stored HTML Injection in Tag Delete Confirmation

Affected: Packagist: mantisbt/mantisbt

Improper escaping of Tag name when deleting it in tag_delete.php allows an attacker to inject HTML and, if CSP settings permit, achieve execution of arbitrary JavaScript.

### Impact Cross-site scripting (XSS).

### Patches 80990f43153167c73f11eb4b2bc7108d0c3d6b46

### Workarounds * Revert commit d6890320752ecf37bd74d11fe14fe7dc12335be9 * Manually edit language files to remove the sprintf placeholder `%1$s` from *$s_tag_delete_message* string, for example with `sed -r -i '/tag_delete_message/s/.%1\$s.//' -- lang/`

### Credits MantisBT hanks Vishal Shukla for discovering and responsibly reporting the issue.