CVE-2026-82847 Masteriyo LMS < 3.4.1 - Instructor+ Stored XSS via Course Highlights
Instructors can inject malicious scripts into course fields, leading to stored XSS attacks against administrators in the Masteriyo LMS plugin.
- 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-2026-82847?
CVE-2026-82847 is a medium-severity cross-site scripting vulnerability in Unknown Masteriyo LMS, published on 12 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 3.4.1 does not sanitise and escape one of its course fields before outputting it back in the course editor, allowing users with the instructor role to perform Stored Cross-Site Scripting attacks against higher privileged users such as administrators.
Weakness: CWE-79
Which versions are affected by CVE-2026-82847?
How do I fix CVE-2026-82847?
No fix has been published for CVE-2026-82847 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-2026-82847 being exploited?
There is no known exploitation of CVE-2026-82847 in the wild and no public exploit code.
Sources
Also known as GHSA-8hqp-p78r-mqpg.