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6.4
MasterStudy LMS Plugin Allows Attackers to Inject Malicious Code
CVE-2026-0559
Summary
The MasterStudy LMS WordPress Plugin for creating online courses is vulnerable to a security flaw that lets attackers inject malicious code into pages, potentially allowing them to take control of a site. This affects all versions up to 3.7.11. To fix the issue, update the plugin to the latest version or remove it until a patch is available.
Original title
The MasterStudy LMS WordPress Plugin – for Online Courses and Education plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin's 'stm_lms_courses_grid_display' shortcode i...
Original description
The MasterStudy LMS WordPress Plugin – for Online Courses and Education plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin's 'stm_lms_courses_grid_display' shortcode in all versions up to, and including, 3.7.11 due to insufficient input sanitization and output escaping on user supplied attributes. This makes it possible for authenticated attackers, with contributor level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.
nvd CVSS3.1
6.4
Vulnerability type
CWE-79
Cross-site Scripting (XSS)
Published: 14 Feb 2026 · Updated: 10 Mar 2026 · First seen: 6 Mar 2026