config_inc2.php in Mantis before 0.17.4 allows remote attackers to execute arbitrary code or read arbitrary files via the parameters (1) g_bottom_include_page, (2) g_top_include_page, (3) g_css_include_file, (4) g_meta_include_file, or (5) a cookie.

Mantis 0.17.4a and earlier allows remote attackers to view private bugs by modifying the f_id bug ID parameter to (1) bug_update_advanced_page.php, (2) bug_update_page.php, (3) view_bug_advanced_page.php, or (4) view_bug_page.php.

The "View Bugs" page (view_all_bug_page.php) in Mantis 0.17.4a and earlier includes summaries of private bugs for users that do not have access to any projects.

Mantis 0.17.5 and earlier stores its database password in cleartext in a world-readable configuration file, which allows local users to perform unauthorized database operations.

Cross-site scripting (XSS) vulnerability in Mantis bugtracker allows remote attackers to inject arbitrary web script or HTML via (1) the return parameter to login_page.php, (2) e-mail field in signup.php, (3) action parameter to login_select_proj_page.php, or (4) hide_status parameter to view_all_set.php.

signup_page.php in Mantis bugtracker allows remote attackers to send e-mail bombs by creating multiple users and providing the same e-mail address.