Executive brief
MasterStudy LMS is a WordPress learning management system plugin used to deliver online courses and track student progress. Due to missing authorization checks in a REST API endpoint, unauthenticated attackers can retrieve any registered user's course enrollments and learning progress by guessing user IDs, enabling privacy violations and unauthorized access to sensitive educational data.
Technical details
This is an authorization bypass (missing access control check) in the student-courses REST API endpoint. The vulnerable component fails to verify that the requester is authorized to view a specific user's enrollment data before returning it. An unauthenticated attacker can exploit this by obtaining a publicly-exposed REST nonce from the page source, then sending requests to /wp-json/masterstudy-lms/v2/student-courses with an arbitrary user_id parameter. The endpoint returns HTTP 200 and discloses enrolled courses, enrollment counts, and course-completion status. The vulnerability requires only network access and knowledge of valid user IDs (which can be enumerated). MasterStudy LMS versions before 3.7.46 are affected; a patch is available in 3.7.46 and later.
Affected products
- MasterStudy MasterStudy LMS before 3.7.46
Timeline
- 2026-08-31: disclosed
- 2026-09-02: patched: Fixed in version 3.7.46