Medium severity · published Sep 23, 2026
CVE-2026-81339
MasterStudy LMS < 3.7.50 - Subscriber+ Quiz Attempt Grade Disclosure via IDOR
4.3
CVSS
0.3%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
Low
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 19% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
ML
MasterStudy LMS WordPress Plugin ·
before 3.7.50 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-81339
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-81339
wpscan.com
https://wpscan.com/vulnerability/f027d0b1-5d8a-4e80-adb3-bbf97dc53306/
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