CVE-2026-82846 Masteriyo LMS 1.18.0 - 2.3.3 - Instructor+ Stored XSS via Course Custom Fields
Instructors can inject malicious scripts into course fields, executing code in the sessions of visitors and administrators viewing the course.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-82846?
CVE-2026-82846 is a medium-severity cross-site scripting vulnerability in Unknown Masteriyo LMS, published on 5 Sep 2026. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.
Official description
The Masteriyo LMS WordPress plugin before 3.4.0 does not sanitise and escape some course settings before outputting them in a page available to all visitors, allowing users with a course-author role to perform Stored Cross-Site Scripting attacks that run in the session of anyone viewing the course, including a logged-in administrator.
Weakness: CWE-79
Which versions are affected by CVE-2026-82846?
How do I fix CVE-2026-82846?
No fix has been published for CVE-2026-82846 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-82846 being exploited?
There is no known exploitation of CVE-2026-82846 in the wild and no public exploit code.
Sources
Also known as GHSA-q7cm-xchw-5v25.