The MasterStudy LMS WordPress Plugin – for Online Courses and Education plugin for WordPress is vulnerable to union based SQL Injection via the 'user' parameter of the /lms/stm-lms/order/items REST route in all versions up to, and including, 3.2.5 due to insufficient escaping on the user supplied parameter and lack of sufficient preparation on the existing SQL query. This makes it possible for unauthenticated attackers to append additional SQL queries into already existing queries that can be used to extract sensitive information from the database.

The MasterStudy LMS WordPress Plugin WordPress plugin before 3.0.18 does not have proper checks in place during registration allowing anyone to register on the site as an instructor. They can then add courses and/or posts.

Broken Access Control vulnerability in StylemixThemes MasterStudy LMS WordPress Plugin – for Online Courses and Education plugin <= 3.0.8 versions allows any logged-in users, such as subscribers to view the "Orders" of the plugin and get the data related to the order like email, username, and more.

Auth. (contributor+) Stored Cross-Site Scripting (XSS) vulnerability in StylemixThemes MasterStudy LMS WordPress Plugin – for Online Courses and Education plugin <= 3.0.7 versions.

The MasterStudy LMS WordPress plugin before 2.7.6 does to validate some parameters given when registering a new account, allowing unauthenticated users to register as an admin