The MasterStudy LMS WordPress Plugin WordPress plugin before 3.7.50 does not perform a per-object ownership check when returning a quiz attempt result, allowing any authenticated user with a minimal (subscriber) role to read other students' quiz grades, pass/fail status and attempt timestamps by referencing an attempt identifier belonging to another user.

The MasterStudy LMS WordPress Plugin WordPress plugin before 3.7.50 does not verify that the requesting user owns the course before returning its enrolled-student data, allowing users with the MasterStudy LMS WordPress Plugin WordPress plugin before 3.7.50's Instructor role to disclose the names and email addresses of students enrolled in other instructors' courses.

The MasterStudy LMS WordPress Plugin WordPress plugin before 3.7.50 does not perform per-object ownership or capability checks when updating orders through its REST API, allowing users with the Instructor role to modify any order on the site, granting free course enrolment, revoking other users' paid enrolments, and tampering with order notes.

The MasterStudy LMS WordPress Plugin WordPress plugin before 3.7.46 does not perform an authorization check before returning a student's learning statistics, allowing unauthenticated attackers to disclose the course counts, points, certificates, quiz and assignment totals of any registered user.

The MasterStudy LMS WordPress Plugin WordPress plugin before 3.7.46 does not restrict access to a REST route that lists an author's courses, nor does it filter that listing by publication status, allowing unauthenticated users to read the titles and IDs of unpublished (draft, pending and private) courses.

The MasterStudy LMS WordPress Plugin WordPress plugin before 3.7.46 does not properly verify authorization when retrieving order line-item data, allowing any authenticated user including Subscribers to read other instructors' course sales records by supplying another user's identifier.

The MasterStudy LMS WordPress Plugin WordPress plugin before 3.7.42 does not correctly restrict access to order information, allowing any user with the instructor role to read other users' order billing details, including name, email address, phone number and postal address, by enumerating order IDs.

The MasterStudy LMS WordPress Plugin WordPress plugin before 3.7.40 does not verify the amount, receiver, currency or status of a payment notification before marking the corresponding order completed, allowing unauthenticated users to complete full-price orders and gain access to paid content by paying only a token amount.

The MasterStudy LMS WordPress Plugin WordPress plugin before 3.7.43 does not validate a redirect parameter supplied during user registration before using it, allowing unauthenticated attackers to redirect users to arbitrary external URLs.