XSS in Masteriyo Lms

CVE-2026-82846

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.

Vulnerability class: XSS (Cross-Site Scripting)

Published · last modified .

CVSS v3 metric

CVSS v3 base score 6.8 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.004 (36.0th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 36th percentile — 36.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2026-82846: held from 0.002 to 0.004.

EPSS over last 30 days · oldest: 0.002 · newest: 0.004 · change: +0.002

Affected products

  • Masteriyo Lms

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-82846?
CVE-2026-82846 is a medium-severity vulnerability in Masteriyo Lms, classified under Cross-site Scripting. CVSS score: 6.8/10. Published 2026-09-05.
How severe is CVE-2026-82846?
Medium severity. CVSS v3 base score is 6.8 out of 10.