CVE-2026-0559
MEDIUMCVSS Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
Lifecycle Timeline
2Description
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.
Analysis
Stored cross-site scripting in MasterStudy LMS WordPress Plugin versions up to 3.7.11 allows authenticated contributors and above to inject malicious scripts through the 'stm_lms_courses_grid_display' shortcode due to insufficient input sanitization and output escaping. When users access pages containing the injected payload, the arbitrary scripts execute in their browsers, potentially compromising sessions or stealing sensitive data. …
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Remediation
Within 30 days: Identify affected systems running all and apply vendor patches as part of regular patch cycle. Verify Content-Security-Policy and output encoding.
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External POC / Exploit Code
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