MantisBT before 1.3.20 and 2.22.1 allows Post Authentication Command Injection, leading to Remote Code Execution.
https://github.com/mantisbt/mantisbt/commit/fc7668c8e45db55fc3a4b991ea99d2b80861a14c
https://github.com/mantisbt/mantisbt/commit/cebfb9acb3686e8904d80bd4bc80720b54ba08e5
https://github.com/mantisbt/mantisbt/commit/7092573fac31eff41823f13540324db167c8bd52
https://github.com/mantisbt/mantisbt/commit/5fb979604d88c630343b3eaf2b435cd41918c501