CVE-2026-4817

MasterStudy LMS <= 3.7.25 - Authenticated (Subscriber+) Time-based Blind SQL Injection via 'order' and 'orderby' Parameters

Published Apr 17, 2026 CVSS 3.1 · 6.5 Medium EPSS < 1% KEV · Not listed
Description
The MasterStudy LMS WordPress Plugin for Online Courses and Education plugin for WordPress is vulnerable to Time-based Blind SQL Injection via the 'order' and 'orderby' parameters in the /lms/stm-lms/order/items REST API endpoint in versions up to and including 3.7.25. This is due to insufficient input sanitization combined with a design flaw in the custom Query builder class that allows unquoted SQL injection in ORDER BY clauses. When the Query builder detects parentheses in the sort_by parameter, it treats the value as a SQL function and directly concatenates it into the ORDER BY clause without any quoting. While esc_sql() is applied to escape quotes and backslashes, this cannot prevent ORDER BY injection when the values themselves are not wrapped in quotes in the resulting SQL statement. This makes it possible for authenticated attackers, with subscriber-level access and above, to append arbitrary SQL queries via the ORDER BY clause to extract sensitive information from the database including user credentials, session tokens, and other confidential data through time-based blind SQL injection techniques.

Remediation

No solution or workaround provided in the CVE record

Tracking

Sign in to view the affected projects.

Advisories

No advisories available
References
Link Providers
https://plugins.trac.wordpress.org/browser/masterstudy-lms-learning-management-system/tags/3.7.17/_core/lms/classes/models/StmStatistics.php#L202 cve-icon cve-icon
https://plugins.trac.wordpress.org/browser/masterstudy-lms-learning-management-system/tags/3.7.17/_core/lms/classes/models/StmStatistics.php#L238 cve-icon cve-icon
https://plugins.trac.wordpress.org/browser/masterstudy-lms-learning-management-system/tags/3.7.17/_core/lms/classes/vendor/Query.php#L676 cve-icon cve-icon
https://plugins.trac.wordpress.org/browser/masterstudy-lms-learning-management-system/tags/3.7.17/_core/lms/route.php#L16 cve-icon cve-icon
https://plugins.trac.wordpress.org/browser/masterstudy-lms-learning-management-system/trunk/_core/lms/classes/models/StmStatistics.php#L202 cve-icon cve-icon
https://plugins.trac.wordpress.org/browser/masterstudy-lms-learning-management-system/trunk/_core/lms/classes/models/StmStatistics.php#L238 cve-icon cve-icon
https://plugins.trac.wordpress.org/browser/masterstudy-lms-learning-management-system/trunk/_core/lms/classes/vendor/Query.php#L676 cve-icon cve-icon
https://plugins.trac.wordpress.org/browser/masterstudy-lms-learning-management-system/trunk/_core/lms/route.php#L16 cve-icon cve-icon
https://plugins.trac.wordpress.org/changeset/3506029/masterstudy-lms-learning-management-system/trunk/_core/lms/classes/vendor/Query.php cve-icon cve-icon
https://plugins.trac.wordpress.org/changeset?old_path=%2Fmasterstudy-lms-learning-management-system/tags/3.7.25&new_path=%2Fmasterstudy-lms-learning-management-system/tags/3.7.26 cve-icon cve-icon
https://ti.wordfence.io/vendors/patch/1789/download cve-icon cve-icon
https://www.wordfence.com/threat-intel/vulnerabilities/id/7a51fe96-f3d3-46fe-9e3a-fb7c1bd17b05?source=cve cve-icon cve-icon
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Stylemix
Stylemix masterstudy Lms Wordpress Plugin – For Online Courses And Education
Wordpress
Wordpress wordpress
Vendors & Products Stylemix
Stylemix masterstudy Lms Wordpress Plugin – For Online Courses And Education
Wordpress
Wordpress wordpress
Type Values Removed Values Added
Description The MasterStudy LMS WordPress Plugin for Online Courses and Education plugin for WordPress is vulnerable to Time-based Blind SQL Injection via the 'order' and 'orderby' parameters in the /lms/stm-lms/order/items REST API endpoint in versions up to and including 3.7.25. This is due to insufficient input sanitization combined with a design flaw in the custom Query builder class that allows unquoted SQL injection in ORDER BY clauses. When the Query builder detects parentheses in the sort_by parameter, it treats the value as a SQL function and directly concatenates it into the ORDER BY clause without any quoting. While esc_sql() is applied to escape quotes and backslashes, this cannot prevent ORDER BY injection when the values themselves are not wrapped in quotes in the resulting SQL statement. This makes it possible for authenticated attackers, with subscriber-level access and above, to append arbitrary SQL queries via the ORDER BY clause to extract sensitive information from the database including user credentials, session tokens, and other confidential data through time-based blind SQL injection techniques.
Title MasterStudy LMS <= 3.7.25 - Authenticated (Subscriber+) Time-based Blind SQL Injection via 'order' and 'orderby' Parameters
Weaknesses CWE-89
References
Metrics cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
Wordfence
Published
Updated
Apr 17, 2026, 6:39 PM
Reserved
Mar 25, 2026, 1:39 PM
Status
Deferred
Published
Apr 17, 2026, 2:16 AM
Modified
Jun 17, 2026, 10:57 AM