XSS in Masteriyo Lms

CVE-2026-82847

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.

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 (37.2th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 37th percentile — 37.2% 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-2026-82847: held from 0.004 to 0.004.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000

Affected products

  • Masteriyo Lms

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-82847?
CVE-2026-82847 is a medium-severity vulnerability in Masteriyo Lms, classified under Cross-site Scripting. CVSS score: 6.8/10. Published 2026-09-12.
How severe is CVE-2026-82847?
Medium severity. CVSS v3 base score is 6.8 out of 10.