CVE-2026-81339

MasterStudy LMS < 3.7.50 - Subscriber+ Quiz Attempt Grade Disclosure via IDOR

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

MasterStudy LMS WordPress Plugin

CVSS v3.1 CNA

4.3 MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

EPSS

0.20% chance of exploitation in the next 30 days, 9th percentile

Published

2026-09-23

Proof-of-concept exploits (1)

• https://wpscan.com/vulnerability/f027d0b1-5d8a-4e80-adb3-bbf97dc53306/

References

• CVE Record
• NVD entry