CVE-2026-34463: Mantisbt

High severity, CVSS 8.6. EPSS: 0.5% chance of exploitation in the next 30 days.

Mantis Bug Tracker (MantisBT) is an open source issue tracker. Versions 2.28.1 and prior contain a Stored XSS vulnerability. When cloning an issue originating from a Project other than the current one, the clone form (bug_report_page.php) prepends the source Project name before the category selector without proper escaping, allowing an attacker able to to inject HTML if they can set the Project's name (which typically requires manager or administrator access level). This issue has been resolved in version 2.28.2.

Affected products

• Mantisbt Mantisbt: before 2.28.2 (fixed in 2.28.2)

Published 2026-05-19. Last modified 2026-07-24.