CVE-2026-81339

A Cross Site Scripting (XSS) vulnerability in MasterStudy LMS plugin version 3.7.27 and earlier allows an attacker with subscriber role to inject malicious script. This can lead to session theft or redirection to a malicious site.

The MasterStudy LMS has a Blind SQL Injection vulnerability due to improper neutralization of special elements used in SQL commands. This issue affects versions from n/a through 3.7.29.

The MasterStudy LMS WordPress Plugin before 3.7.50 does not verify that a user is enrolled in a course before recording lesson completions against it, allowing any authenticated user, such as a subscriber, to create course progress records for courses they have no access to.

The MasterStudy LMS WordPress plugin before version 3.7.50 does not properly sanitise and restrict HTML in user-submitted content before storing it and rendering it to other users, allowing users with subscriber-level accounts and above to perform stored HTML injection, such as embedding iframes, that can be leveraged for phishing and content spoofing against other users viewing the content.

The MasterStudy LMS 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 Instructor role to disclose the names and email addresses of students enrolled in other instructors' courses.

The MasterStudy LMS 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 before version 3.7.46 does not properly verify ownership of a curriculum object before acting on it, allowing authenticated users with the instructor role to delete or modify curriculum sections and materials belonging to courses owned by other instructors.

The MasterStudy LMS 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nor does it filter that listing by publication status, allowing unauthenticated users to read the titles and IDs of unpublished (draft, pending and private) courses.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 before version 3.7.46 does not properly verify ownership of quiz question identifiers, allowing users with instructor access to read other instructors' quiz questions, including the correct answers and explanations.

The MasterStudy LMS 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.