stylemix MasterStudy LMS WordPress Plugin up to 3.7.25 on WordPress REST API Endpoint /lms/stm-lms/order/items esc_sql orderby sql injection

Summaryinfo

A vulnerability was found in stylemix MasterStudy LMS WordPress Plugin up to 3.7.25 on WordPress. It has been rated as critical. Affected by this vulnerability is the function esc_sql of the file /lms/stm-lms/order/items of the component REST API Endpoint. This manipulation of the argument orderby causes sql injection. This vulnerability appears as CVE-2026-4817. The attack may be initiated remotely. There is no available exploit. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in stylemix MasterStudy LMS WordPress Plugin up to 3.7.25 on WordPress. It has been declared as critical. Affected by this vulnerability is the function esc_sql of the file /lms/stm-lms/order/items of the component REST API Endpoint. The manipulation of the argument orderby with an unknown input leads to a sql injection vulnerability. The CWE definition for the vulnerability is CWE-89. The product constructs all or part of an SQL command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended SQL command when it is sent to a downstream component. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

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.

The weakness was presented by Naoya Takahashi. The advisory is shared at wordfence.com. This vulnerability is known as CVE-2026-4817 since 03/25/2026. The exploitation appears to be easy. The attack can be launched remotely. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1505 for this issue.

Upgrading to version 3.7.17 eliminates this vulnerability.

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Productinfo

Type

• WordPress Plugin

Vendor

• stylemix

Name

• MasterStudy LMS WordPress Plugin

Version

• 3.7.0
• 3.7.1
• 3.7.2
• 3.7.3
• 3.7.4
• 3.7.5
• 3.7.6
• 3.7.7
• 3.7.8
• 3.7.9
• 3.7.10
• 3.7.11
• 3.7.12
• 3.7.13
• 3.7.14
• 3.7.15
• 3.7.16
• 3.7.17
• 3.7.18
• 3.7.19
• 3.7.20
• 3.7.21
• 3.7.22
• 3.7.23
• 3.7.24
• 3.7.25

CPE 2.3info

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• 🔒
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CPE 2.2info

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