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

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Summary

CVECVE-2026-4817
StatePUBLISHED
AssignerWordfence
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-17 02:16:05 UTC
Updated2026-04-17 02:16:05 UTC
DescriptionThe 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.

Risk And Classification

Primary CVSS: v3.1 6.5 MEDIUM from [email protected]

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

Problem Types: CWE-89 | CWE-89 CWE-89 Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection')

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary6.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
3.1CNADECLARED6.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Stylemix MasterStudy LMS WordPress Plugin For Online Courses And Education affected 3.7.25 semver Not specified

References

ReferenceSourceLinkTags
plugins.trac.wordpress.org/browser/masterstudy-lms-learning-management-system/trunk/_cor... [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/changeset [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/changeset/3506029/masterstudy-lms-learning-management-system/... [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/masterstudy-lms-learning-management-system/trunk/_cor... [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/masterstudy-lms-learning-management-system/tags/3.7.1... [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/masterstudy-lms-learning-management-system/trunk/_cor... [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/masterstudy-lms-learning-management-system/tags/3.7.1... [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/masterstudy-lms-learning-management-system/trunk/_cor... [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/masterstudy-lms-learning-management-system/tags/3.7.1... [email protected] plugins.trac.wordpress.org
ti.wordfence.io/vendors/patch/1789/download [email protected] ti.wordfence.io
plugins.trac.wordpress.org/browser/masterstudy-lms-learning-management-system/tags/3.7.1... [email protected] plugins.trac.wordpress.org
www.wordfence.com/threat-intel/vulnerabilities/id/7a51fe96-f3d3-46fe-9e3a-fb7c1... [email protected] www.wordfence.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Naoya Takahashi (en)

Additional Advisory Data

SourceTimeEvent
CNA2026-03-25T13:55:10.000ZVendor Notified
CNA2026-04-16T12:48:08.000ZDisclosed
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