WordPress security changelog
MEDIUM CVE-2026-4817 Deferred

MasterStudy LMS WordPress Plugin – for Online Courses and Education: SQL injection

MasterStudy LMS WordPress Plugin – for Online Courses and Education is affected by SQL injection. Exploitation requires an authenticated subscriber account. A successful request can alter database queries and expose or modify WordPress data. The published affected range is <= 3.7.25.

CVE / CNA score 6.5 CVSS 3.1 · security@wordfence.com
NVD score Pending NVD has not published its own CVSS assessment.
Component
MasterStudy LMS WordPress Plugin – for Online Courses and Education
Plugin slug
masterstudy-lms-learning-management-system
Affected
<= 3.7.25
Safe version
See mitigation notes
Published
Apr 17, 2026
Weakness
CWE-89 — Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection')

This CVE was published Apr 17, 2026 and is one of 31 known issues for this plugin.

What to do

Update, patch or deactivate.

No fixed release is identified. Update MasterStudy LMS WordPress Plugin – for Online Courses and Education when a release after 3.7.25 becomes available; until then, disable and remove it when the site's risk warrants. The official upstream changelog lists version 3.7.42, which is newer than the published affected range. Its changelog does not clearly confirm this specific fix, so it is not counted as a known-safe release.

No confirmed safe version is listed. Consider a vendor-supported patch or temporarily restricting the affected functionality while you assess the risk.

Deactivate only when warranted by your risk profile, or when advised by your hosting provider in the limited circumstances where the vulnerability cannot otherwise be mitigated. If you’re unsure which action is appropriate, contact Fused or your hosting provider for guidance.

Source record

Technical 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.

CVE / CNA vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

References

Primary and upstream sources