CVE-2026-82849 Masteriyo LMS < 3.4.2 - Subscriber+ Arbitrary User Course Progress Disclosure via IDOR
Authenticated users can view other users' course progress records due to missing ownership verification in the Masteriyo LMS plugin.
- 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-2026-82849?
CVE-2026-82849 is a medium-severity missing authorization vulnerability in Unknown Masteriyo LMS, published on 24 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
The Masteriyo LMS WordPress plugin before 3.4.2 does not verify that the user making the request owns the course-progress records being returned, allowing any authenticated user, such as a self-registered subscriber, to read another user's learning activity. The ownership check it applies is skipped whenever the requested account is not named with a non-zero value, in which case the records of every learner on the site are returned at once.
Weakness: CWE-639
Which versions are affected by CVE-2026-82849?
How do I fix CVE-2026-82849?
No fix has been published for CVE-2026-82849 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-2026-82849 being exploited?
There is no known exploitation of CVE-2026-82849 in the wild and no public exploit code.
Sources
Also known as GHSA-cgmx-54pv-6c9x.