CVE-2026-34390
MediumCVSS 5.1Exploitation Probability (EPSS)
Low risk35th percentile - higher than 35% of all known CVEs
Summary
In Mantis Bug Tracker (MantisBT) versions 2.28.1 and prior, a privilege escalation vulnerability exists. Users with manage_project_threshold access level (manager by default) can grant project-level administrator access to any user in any project they manage. The issue has been fixed in version 2.28.2.
Risk Assessment
The organization is at risk of unauthorized privilege escalation within a project, which could lead to uncontrolled changes in project configuration, though it does not grant access to global administrative functions.
Recommendation
Update MantisBT to version 2.28.2 or later, which contains the fix.
Original NVD description (English source)
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.