MantisBT is Vulnerable to Stored HTML Injection/XSS in Clone Issue Form
Impact
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).
Source excerpt · OSVWhen 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 is mitigated by Content Security Policy which restricts scripts execution.
Affected packages
Start with the recorded fix for your release branch. Check your installed version and test compatibility before upgrading. Fixing this advisory does not rule out other vulnerabilities in the release.
| Affected range | Recorded fix |
|---|---|
| Earlier releases before 2.28.2Ecosystem versions | 2.28.2 |
Version evidence: OSV · GHSA-fvjf-68wh-rwp2
View original version evidence (76 explicit versions)
Original source description
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).
Impact
Cross-site scripting (XSS). This is mitigated by Content Security Policy which restricts scripts execution.
Patches
- df22697ae497ddd93f3d9132fdf4979db8d081cd
Workarounds
Make sure Project names do not contain any HTML tags.
Credits
Thanks to Vishal Shukla for discovering and responsibly reporting the issue.
The vulnerability was also identified and independently reported by @siunam321 (Tang Cheuk Hei), prior to this Advisory's publication.
References
- Security advisory github.com/mantisbt/mantisbt/security/advisories/GHSA-fvjf-68wh-rwp2
- Security advisory nvd.nist.gov/vuln/detail/CVE-2026-34463
- Patch github.com/mantisbt/mantisbt/commit/df22697ae497ddd93f3d9132fdf4979db8d081cd
- Source reference github.com/mantisbt/mantisbt
- Source reference mantisbt.org/bugs/view.php