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Medium severity · published Feb 14, 2026
CVE-2026-0559
MasterStudy LMS WordPress Plugin – for Online Courses and Education <= 3.7.11 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'stm_lms_courses_grid_display' Shortcode
6.4
CVSS
0.2%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 14% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
ML
MasterStudy LMS WordPress Plugin – for Online Courses and Education · stylemix
through 3.7.11 · source: vendor
Affected product
ML
MasterStudy LMS WordPress Plugin – for Online Courses and Education
stylemix
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-0559
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-0559
plugins.trac.wordpress.org
https://plugins.trac.wordpress.org/changeset/3435814/masterstudy-lms-learning-management-system
www.wordfence.com
https://www.wordfence.com/threat-intel/vulnerabilities/id/b1146350-4491-4fa0-8b78-6dbc00903160?source=cve
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