What’s Vulnerable › Vulnerabilities
CVE-2026-81339: MasterStudy LMS < 3.7.50 - Subscriber+ Quiz Attempt Grade Disclosure via IDOR
- Severity: medium (CVSS 4.3 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.3% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-09-23 · updated 2026-09-23
- Weakness: CWE-639
Description
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
- MasterStudy LMS WordPress Plugin: before 3.7.50 — fixed in 3.7.50
How to fix
Upgrade to a fixed version: MasterStudy LMS WordPress Plugin 3.7.50. Check the vendor advisory for mitigations.
References
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