Multiple SQL injection vulnerabilities in fs-admin/fs-admin.php in the Mingle Forum plugin 1.0.32.1 and other versions before 1.0.33 for WordPress allow remote authenticated users to execute arbitrary SQL commands via the (1) delete_usrgrp[] parameter in a delete_usergroups action, (2) usergroup parameter in an add_user_togroup action, or (3) add_forum_group_id parameter in an add_forum_submit action.
The product constructs all or part of an SQL command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended SQL command when it is sent to a downstream component. Without sufficient removal or quoting of SQL syntax in user-controllable inputs, the generated SQL query can cause those inputs to be interpreted as SQL instead of ordinary user data.