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EUVD-2026-277213

fkie_cve-2026-33548

Mantis Bug Tracker (MantisBT) is an open source issue tracker. In version 2.28.0, improper escaping of tag names retrieved from History in Timeline (my_view_page.php) allows an attacker to inject HTML and, if CSP settings permit, achieve execution of arbitrary JavaScript, when displaying a tag that has been renamed or deleted. Version 2.28.1 contains a patch. Workarounds include editing offending History entries (using SQL) and wrapping `$this->tag_name` in a string_html_specialchars() call in IssueTagTimelineEvent::html().

GHSA-73vx-49mv-v8w5 — MantisBT has Stored HTML Injection/XSS when displaying Tags in Timeline

Affected: Packagist: mantisbt/mantisbt

Improper escaping of tag names retrieved from History in Timeline (my_view_page.php) allows an attacker to inject HTML and, if CSP settings permit, achieve execution of arbitrary JavaScript, when displaying a tag that has been renamed or deleted.

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

### Patches f32787c14d4518476fe7f05f992dbfe6eaccd815

### Workarounds * Edit offending History entries (using SQL) * Wrap `$this->tag_name` in a string_html_specialchars() call in IssueTagTimelineEvent::html()

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