Mantis is "a web-based bugtracking system. It is written in the PHP scripting language and requires the MySQL database and a webserver". Mantis is vulnerable to file inclusion vulnerability due lack of sanitation in bug_sponsorship_list_view_inc.php file.
Input passed to the "t_core_path" parameter in "bug_sponsorship_list_view_inc.php" isn't properly verified, before it used to include files. This can be exploited to include arbitrary files from external and local resources.