CVE-2026-82846mediumCWE-79

CVE-2026-82846: medium-severity vulnerability in Masteriyo LMS

Masteriyo LMS 1.18.0 - 2.3.3 - Instructor+ Stored XSS via Course Custom Fields

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33Vexday Risk Score

No sign of exploitation. It has a public proof of concept.

ssvc Attendcvss 6.8epss 0.4%
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.
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:H
Affected products
Unknown · Masteriyo LMS
⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.
Related CVEs — Masteriyo LMS

In the same product, most dangerous first.

CVE-2026-82845CRITICALMasteriyo LMS < 3.4.1 - Subscriber+ PHP Object InjectionEPSS 0.6%CVE-2026-82847MEDIUMMasteriyo LMS < 3.4.1 - Instructor+ Stored XSS via Course HighlightsEPSS 0.4%CVE-2026-13332CRITICALMasteriyo LMS < 2.3.1 - Unauthenticated Arbitrary User Session Termination (Denial of Service)EPSS 0.4%CVE-2026-82848MEDIUMMasteriyo LMS 1.3.1 - 2.3.3 - Unauthenticated Course Enrollment DisclosureEPSS 0.3%CVE-2026-82851LOWMasteriyo LMS 1.14.0 - 3.4.0 - Instructor+ Arbitrary Post Disclosure via IDOREPSS 0.3%CVE-2026-10824MEDIUMMasteriyo LMS < 2.2.1 - Unauthenticated Course Progress Disclosure and DeletionEPSS 0.3%