Tutor LMS Plugin up to 3.9.4/3.9.6 on WordPress coupon_code sql injection

Summaryinfo

A vulnerability classified as critical has been found in Tutor LMS Plugin up to 3.9.4/3.9.6 on WordPress. This affects an unknown function. This manipulation of the argument coupon_code causes sql injection. This vulnerability is registered as CVE-2025-13673. Remote exploitation of the attack is possible. No exploit is available.

Detailsinfo

A vulnerability was found in Tutor LMS Plugin up to 3.9.4/3.9.6 on WordPress. It has been declared as critical. Affected by this vulnerability is some unknown processing. The manipulation of the argument coupon_code 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 Tutor LMS – eLearning and online course solution plugin for WordPress is vulnerable to SQL Injection via the 'coupon_code' parameter in all versions up to, and including, 3.9.6 due to insufficient escaping on the user supplied parameter and lack of sufficient preparation on the existing SQL query. This makes it possible for unauthenticated attackers to append additional SQL queries into already existing queries that can be used to extract sensitive information from the database. NOTE: This vulnerability was partially mitigated in versions 3.9.4 and 3.9.6.

It is possible to read the advisory at wordfence.com. This vulnerability is known as CVE-2025-13673. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 03/03/2026). The attack technique deployed by this issue is T1505 according to MITRE ATT&CK.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2025-208143). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Type

• WordPress Plugin

Name

• Tutor LMS Plugin

Version

• 3.9.0
• 3.9.1
• 3.9.2
• 3.9.3
• 3.9.4
• 3.9.5
• 3.9.6

CPE 2.3info

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CPE 2.2info

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Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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