CVE-2026-81339CWE-639

CVE-2026-81339

Medium · published September 23, 2026

CVSS v3.1
4.3
EPSS
0%
Percentile
8.9
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
4.3 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
CVSS v4.0
Not supplied
EPSS
0.00197 · 8.9th percentile
Weakness
CWE-639 · Authorization Bypass Through User-Controlled Key
Published
2026-09-23T10:17Z
References (1)
https://wpscan.com/vulnerability/f027d0b1-5d8a-4e80-adb3-bbf97dc53306/ · [email protected]
EPSS history
Timeline
  • 24 SEP 03:25Z
    EPSS moved — → 0%
    epss
  • 23 SEP 06:00Z
    MasterStudy LMS < 3.7.50 - Subscriber+ Quiz Attempt Grade Disclosure via IDOR
    cvelistv5