Vulnerability in Masterstudy Lms WordPress Plugin

CVE-2026-81338

The MasterStudy LMS WordPress Plugin WordPress plugin before 3.7.50 does not properly sanitise and restrict HTML in user-submitted content before storing it and rendering it to other users, allowing users with subscriber-level accounts and above to perform stored HTML injection, such as embedding iframes, that can be leveraged for phishing and content spoofing against other users viewing the content.

Published · last modified .

CVSS v3 metric

CVSS v3 base score 4.6 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.001 (2.0th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 2nd percentile — 2.0% 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-2026-81338: held from 0.001 to 0.001.

EPSS over last 30 days · oldest: 0.001 · newest: 0.001 · change: +0.000

Affected products

  • Masterstudy Lms WordPress Plugin

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-81338?
CVE-2026-81338 is a medium-severity vulnerability in Masterstudy Lms WordPress Plugin, classified under Insufficient Verification of Data Authenticity. CVSS score: 4.6/10. Published 2026-09-23.
How severe is CVE-2026-81338?
Medium severity. CVSS v3 base score is 4.6 out of 10.