GHSA-j3v9-553h-x28jHigh

MantisBT is Vulnerable to XSS leading to account takeover via updating a user's font family preference

Published
May 11, 2026
Last Modified
June 8, 2026

🔗 CVE IDs covered (1)

CVE-2026-40596 →

📋 Description

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), the attacker could achieve account takeover.

Patches

  • 9e8409cdd979eba86ef532756fc47c1d8112d22d

Workarounds

None

Credits

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

🎯 Affected products1

  • composer/mantisbt/mantisbt:>= 2.11.0, <= 2.28.1

🔗 References (7)