GHSA-j3v9-553h-x28j
MantisBT is Vulnerable to XSS leading to account takeover via updating a user's font family preference
Quick fix
GHSA-j3v9-553h-x28j — mantisbt/mantisbt: upgrade to the fixed version with the command below.
composer require mantisbt/mantisbt:^2.28.2Details
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.
Are you affected?
Enter the version of the package you're using.
Affected packages
2.11.0Fixed in: 2.28.2composer require mantisbt/mantisbt:^2.28.2References
- https://github.com/mantisbt/mantisbt/security/advisories/GHSA-9c3j-xm6v-j7j3[WEB]
- https://github.com/mantisbt/mantisbt/security/advisories/GHSA-j3v9-553h-x28j[WEB]
- https://nvd.nist.gov/vuln/detail/CVE-2026-40596[ADVISORY]
- https://github.com/mantisbt/mantisbt/commit/9e8409cdd979eba86ef532756fc47c1d8112d22d[WEB]
- https://github.com/mantisbt/mantisbt[PACKAGE]
- https://mantisbt.org/bugs/view.php?id=37011[WEB]
- https://mantisbt.org/bugs/view.php?id=37016[WEB]