CVE-2026-34390MantisBT: Privilege Escalation from Manager to Administrator

Official description

Mantis Bug Tracker (MantisBT) is an open source issue tracker. Versions 2.28.1 and prior have a Privilege Escalation vulnerability where insufficient access control checks in ProjectUsersAddCommand (manage_proj_user_add.php) allow users having manage_project_threshold access level (manager by default) to grant project-level administrator access to any user (including themselves) in any Project they have manager rights in. The normal project-user add form restricts the selectable access levels to the actor's own project role or below. However, the backend handler still accepts a forged higher access_level value and writes it. The consequences of the privilege escalation are slight, as having administrator access at Project level is effectively not very different from being manager, and it does not actually give administrator privileges on the whole MantisBT instance. In particular, it does not let the upgraded user delete the Project or grant them any access to global administrative functions such as managing Users, Projects, Plugins, Custom Fields, etc. This issue has been fixed in version 2.28.2.

Affected packages & fixed versions

Affected products (as reported)

References

• https://github.com/mantisbt/mantisbt/security/advisories/GHSA-frf7-jhp9-jxm6 x_refsource_CONFIRM
• https://github.com/mantisbt/mantisbt/commit/69e0180f180ed5acf48a8d281a73683a7bf32461 x_refsource_MISC
• https://mantisbt.org/bugs/view.php?id=36995 x_refsource_MISC
• https://mantisbt.org/bugs/view.php?id=37002 x_refsource_MISC