The MasterStudy LMS WordPress Plugin WordPress plugin before 3.3.24 does not prevent students from creating instructor accounts, which could be used to get access to functionalities they shouldn't have.
The MasterStudy LMS WordPress Plugin – for Online Courses and Education plugin for WordPress is vulnerable to unauthorized access, modification, and loss of data due to a missing capability check on several functions in versions up to, and including, 3.3.8. This makes it possible for authenticated attackers, with subscriber level permissions and above, to read and modify content such as course questions, post titles, and taxonomies.