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EUVD-2026-320166

fkie_cve-2026-40596

Mantis Bug Tracker (MantisBT) is an open source issue tracker. Versions 2.11.0 through 2.28.1 allow any authenticated user to inject arbitrary HTML by updating their account's font family. Upon exploitation, an XSS payload would be reflected on every MantisBT page. Leveraging another vulnerability (CSP bypass, see GHSA-9c3j-xm6v-j7j3), the attacker could achieve account takeover. This issue has been fixed in version 2.28.2.

GHSA-j3v9-553h-x28j — MantisBT is Vulnerable to XSS leading to account takeover via updating a user's font family preference

Affected: Packagist: mantisbt/mantisbt

Any authenticated user can inject arbitrary HTML via updating their account's font family.

### Impact Cross-site scripting. The injected payload will be reflected in every MantisBT page.

Leveraging another vulnerability (CSP bypass, see [GHSA-9c3j-xm6v-j7j3](https://github.com/mantisbt/mantisbt/security/advisories/GHSA-9c3j-xm6v-j7j3)), the attacker could achieve account takeover.

### Patches - 9e8409cdd979eba86ef532756fc47c1d8112d22d

### Workarounds None

### Credits Thanks to siunam (Tang Cheuk Hei) for discovering and responsibly reporting the issue.