What’s Vulnerable › Vulnerabilities
CVE-2026-82846: Masteriyo LMS 1.18.0 - 2.3.3 - Instructor+ Stored XSS via Course Custom Fields
- Severity: medium (CVSS 6.8 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.4% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-09-05 · updated 2026-09-08
- Weakness: CWE-79
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.
Affected products
- Masteriyo LMS: from 1.18.0 before 3.4.0 — fixed in 3.4.0
How to fix
Upgrade to a fixed version: Masteriyo LMS 3.4.0. Check the vendor advisory for mitigations.
References
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