CVE-2026-81339 MasterStudy LMS < 3.7.50 - Subscriber+ Quiz Attempt Grade Disclosure via IDOR
Authenticated subscribers can read other students' quiz grades and attempt details due to missing ownership checks in MasterStudy LMS.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-81339?
CVE-2026-81339 is a medium-severity missing authorization vulnerability in Unknown MasterStudy LMS WordPress Plugin, published on 23 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
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.
Weakness: CWE-639
Which versions are affected by CVE-2026-81339?
How do I fix CVE-2026-81339?
No fix has been published for CVE-2026-81339 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-81339 being exploited?
There is no known exploitation of CVE-2026-81339 in the wild and no public exploit code.
Sources
Also known as GHSA-fj8j-x93w-h29w.