high6.1
CVE-2026-33548
MantisBT has Stored HTML Injection/XSS when displaying Tags in Timeline
Impact
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().
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| composer | mantisbt/mantisbt | = 2.28.0 | 2.28.2 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Mantisbt | Mantisbt | Version 2.28.0 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-73vx-49mv-v8w5
- https://github.com/mantisbt/mantisbt/security/advisories/GHSA-73vx-49mv-v8w5
- https://nvd.nist.gov/vuln/detail/CVE-2026-33548
- https://github.com/mantisbt/mantisbt/commit/f32787c14d4518476fe7f05f992dbfe6eaccd815
- https://mantisbt.org/bugs/view.php?id=36973