Stored Cross-Site Scripting Vulnerability in MasterStudy LMS Plugin by WordPress
CVE-2026-0559

6.4MEDIUM

Key Information:

Vendor

WordPress
Status
Masterstudy Lms WordPress Plugin – For Online Courses And Education
Vendor
CVE Published:
14 February 2026

What is CVE-2026-0559?

The MasterStudy LMS WordPress Plugin designed for online courses is susceptible to Stored Cross-Site Scripting through the 'stm_lms_courses_grid_display' shortcode. This vulnerability arises from inadequate input validation and output escaping of user-supplied attributes. Authenticated attackers with contributor access or higher can exploit this flaw by injecting malicious web scripts into web pages. When users access these compromised pages, the scripts execute, potentially leading to various security implications.

Affected Version(s)

MasterStudy LMS WordPress Plugin – for Online Courses and Education 0 <= 3.7.11

References

https://www.wordfence.com/threat-intel/vulnerabilities/id...
https://plugins.trac.wordpress.org/changeset/3435814/mast...

CVSS V3.1

Score:
6.4
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Muhammad Yudha - DJ
.