Vulnerability · Published Sep 23, 2026 · Assigned by WPScan

CVE-2026-81339MasterStudy LMS < 3.7.50 - Subscriber+ Quiz Attempt Grade Disclosure via IDOR

Medium 4.3

In plain English

A medium-severity authorization bypass via user-controlled key in MasterStudy LMS WordPress Plugin from Unknown. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 19% of all known vulnerabilities).

Severity (CVSS 3.1)4.3Medium

Exploit odds (30 days)0.3%top 80.7% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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 (as reported)

Vendor	Product	Versions
Unknown	MasterStudy LMS WordPress Plugin	0 – before 3.7.50

Weakness: CWE-639 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

References

https://wpscan.com/vulnerability/f027d0b1-5d8a-4e80-adb3-bbf97dc53306/ exploit, vdb-entry, technical-description