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.
The MasterStudy LMS plugin for WordPress is vulnerable to Local File Inclusion in all versions up to, and including, 3.3.3 via the 'template' parameter. This makes it possible for unauthenticated attackers to include and execute arbitrary files on the server, allowing the execution of any PHP code in those files. This can be used to bypass access controls, obtain sensitive data, or achieve code execution in cases where images and other “safe” file types can be uploaded and included.