core/string_api.php in Mantis before 1.1.3 does not check the privileges of the viewer before composing a link with issue data in the source anchor, which allows remote attackers to discover an issue's title and status via a request with a modified issue number.

manage_proj_page.php in Mantis before 1.1.4 allows remote authenticated users to execute arbitrary code via a sort parameter containing PHP sequences, which are processed by create_function within the multi_sort function in core/utility_api.php.

Mantis before 1.1.3 does not unset the session cookie during logout, which makes it easier for remote attackers to hijack sessions.

Cross-site request forgery (CSRF) vulnerability in manage_user_create.php in Mantis 1.1.1 allows remote attackers to create new administrative users via a crafted link.