CVE-2026-4817 [Medium] | SQL Injection in The /lms/stm-Lms/order/it…

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.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-05-22	0.05%	0.03%	-0.02%
2	2026-04-17	—	0.05%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-05-22

0.05%

0.03%

-0.02%

2026-04-17

—

0.05%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
6.5	3.1	MEDIUM	`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N` Click to expand Attack vector (AV:N) Could be attacked over the internet or any normal routed network—not just someone sitting at the machine. Attack complexity (AC:L) Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup. Privileges required (PR:L) A normal user session is enough; they don’t have to be admin. User interaction (UI:N) Nobody has to click “OK” or open a trap file; it can work without a victim helping. Scope (S:U) Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems. Confidentiality (C:H) Serious risk that confidential data gets exposed in a big way. Integrity (I:N) Data isn’t meaningfully altered or forged. Availability (A:N) Service keeps running; no real outage angle.	2.8	3.6	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

6.5

3.1

MEDIUM

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

Attack vector (AV:N): Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L): Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L): A normal user session is enough; they don’t have to be admin.
User interaction (UI:N): Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U): Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H): Serious risk that confidential data gets exposed in a big way.
Integrity (I:N): Data isn’t meaningfully altered or forged.
Availability (A:N): Service keeps running; no real outage angle.

2.8

3.6

[email protected]

Affected software / configurations for CVE-2026-4817

Vendor	Product	Version	Raw CPE
No affected products in dataset.

URL	Tags
https://plugins.trac.wordpress.org/browser/masterstudy-lms-learning-management-system/tags/3.7.17/_core/lms/classes/models/StmStatistics.php#L202
https://plugins.trac.wordpress.org/browser/masterstudy-lms-learning-management-system/tags/3.7.17/_core/lms/classes/models/StmStatistics.php#L238
https://plugins.trac.wordpress.org/browser/masterstudy-lms-learning-management-system/tags/3.7.17/_core/lms/classes/vendor/Query.php#L676
https://plugins.trac.wordpress.org/browser/masterstudy-lms-learning-management-system/tags/3.7.17/_core/lms/route.php#L16
https://plugins.trac.wordpress.org/browser/masterstudy-lms-learning-management-system/trunk/_core/lms/classes/models/StmStatistics.php#L202
https://plugins.trac.wordpress.org/browser/masterstudy-lms-learning-management-system/trunk/_core/lms/classes/models/StmStatistics.php#L238
https://plugins.trac.wordpress.org/browser/masterstudy-lms-learning-management-system/trunk/_core/lms/classes/vendor/Query.php#L676
https://plugins.trac.wordpress.org/browser/masterstudy-lms-learning-management-system/trunk/_core/lms/route.php#L16
https://plugins.trac.wordpress.org/changeset/3506029/masterstudy-lms-learning-management-system/trunk/_core/lms/classes/vendor/Query.php
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
https://ti.wordfence.io/vendors/patch/1789/download
https://www.wordfence.com/threat-intel/vulnerabilities/id/7a51fe96-f3d3-46fe-9e3a-fb7c1bd17b05?source=cve

URL

CVE-2026-4817 | MasterStudy LMS <= 3.7.25 - Authenticated (Subscriber+) Time-based Blind SQL Injection via 'order' and 'orderby' Parameters

Exploit prediction scoring system (EPSS) score for CVE-2026-4817

Common vulnerability scoring system (CVSS) metrics for CVE-2026-4817

Weakness enumeration for CVE-2026-4817

GitHub Security Advisory for CVE-2026-4817

Affected software / configurations for CVE-2026-4817

References for CVE-2026-4817