High severityNVD Advisory· Published Mar 23, 2026· Updated Mar 24, 2026
MantisBT has Stored HTML Injection / XSS when displaying Tags in Timeline
CVE-2026-33548
Description
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().
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Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
mantisbt/mantisbtPackagist | >= 2.28.0, < 2.28.2 | 2.28.2 |
Affected products
2Patches
Vulnerability mechanics
References
5- github.com/advisories/GHSA-73vx-49mv-v8w5ghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-33548ghsaADVISORY
- github.com/mantisbt/mantisbt/commit/f32787c14d4518476fe7f05f992dbfe6eaccd815ghsax_refsource_MISCWEB
- github.com/mantisbt/mantisbt/security/advisories/GHSA-73vx-49mv-v8w5ghsax_refsource_CONFIRMWEB
- mantisbt.org/bugs/view.phpghsaWEB
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