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CVE-2026-40596

MantisBT is vulnerable to XSS and potential account takeover via user font family preference update

CVSS 7.2 HIGHEPSS 0.4%CWE-79
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.
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:P/VC:H/VI:L/VA:L/SC:H/SI:H/SA:L
Affected products
mantisbt · mantisbt

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References
https://github.com/mantisbt/mantisbt/commit/9e8409cdd979eba86ef532756fc47c1d8112d22dhttps://github.com/mantisbt/mantisbt/security/advisories/GHSA-9c3j-xm6v-j7j3https://github.com/mantisbt/mantisbt/security/advisories/GHSA-j3v9-553h-x28jhttps://mantisbt.org/bugs/view.php?id=37011https://mantisbt.org/bugs/view.php?id=37016