MantisBT 2.28.0 XSS via History tag names in my_view_page.php
CVE-2026-33548 Published on March 23, 2026
MantisBT has Stored HTML Injection / XSS when displaying Tags in Timeline
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().
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-2026-33548 has been classified to as a XSS vulnerability or weakness.
Products Associated with CVE-2026-33548
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Affected Versions
mantisbt Version = 2.28.0 is affected by CVE-2026-33548Exploit 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.