Stored XSS in MantisBT 2.28.1 bug_report_page.php; Fixed in 2.28.2
CVE-2026-34463 Published on May 19, 2026
MantisBT has Stored HTML Injection/XSS via Clone Issue Form
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.
Weakness Type
What is a XSS Vulnerability?
The software does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.
CVE-2026-34463 has been classified to as a XSS vulnerability or weakness.
Products Associated with CVE-2026-34463
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Affected Versions
mantisbt Version < 2.28.2 is affected by CVE-2026-34463Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.