CVE-2026-81339: Unknown Masterstudy Lms WordPress Plugin

Medium severity, CVSS 4.3. EPSS: 0.2% chance of exploitation in the next 30 days.

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.

Affected products

• Unknown Masterstudy Lms WordPress Plugin: before 3.7.50 (fixed in 3.7.50)

Published 2026-09-23. Last modified 2026-09-23.