high8.6
CVE-2026-34463
MantisBT is Vulnerable to Stored HTML Injection/XSS in Clone Issue Form
Impact
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 packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| composer | mantisbt/mantisbt | <= 2.28.1 | 2.28.2 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-fvjf-68wh-rwp2
- https://github.com/mantisbt/mantisbt/security/advisories/GHSA-fvjf-68wh-rwp2
- https://github.com/mantisbt/mantisbt/commit/df22697ae497ddd93f3d9132fdf4979db8d081cd
- https://mantisbt.org/bugs/view.php?id=36986
- https://nvd.nist.gov/vuln/detail/CVE-2026-34463