CVE-2026-66624 in WPMasterToolKit Plugin
Summary
by MITRE • 09/17/2026
Administrator SQL Injection in WPMasterToolKit <= 2.22.0 versions.
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Analysis
by VulDB Data Team • 09/17/2026
The vulnerability identified as an administrator-level SQL injection flaw within WPMasterToolKit versions up to and including 2.22.0 represents a critical security deficiency that compromises the integrity of WordPress-based applications utilizing this plugin or framework. This specific weakness arises from inadequate input validation and sanitization mechanisms when processing user-supplied data intended for administrative functions. Unlike standard SQL injection vulnerabilities that may affect public-facing endpoints, this particular flaw targets authentication and authorization logic, allowing an attacker to manipulate backend database queries directly through crafted inputs in administrator-specific interfaces. The presence of such a vulnerability indicates a fundamental failure in implementing secure coding practices regarding dynamic query construction, where user input is concatenated into SQL statements without proper escaping or the use of parameterized queries.
From a technical perspective, this flaw typically manifests when administrative actions involve querying database tables to retrieve, update, or delete records based on parameters provided by the administrator interface. If these parameters are not strictly validated against expected data types and formats, an attacker can inject malicious SQL code into the input fields. This injected code is then executed by the underlying Database Management System with the privileges of the web application process. In many cases involving administrative endpoints, this execution context grants elevated permissions, potentially equivalent to a database superuser or root access depending on how the application connects to the backend storage. The attacker can exploit this condition to bypass authentication mechanisms entirely, extract sensitive data such as user credentials and session tokens from other tables within the same database schema, modify existing records to escalate privileges, or even execute operating system commands if specific database features like xp_cmdshell are enabled in Microsoft SQL Server environments.
The operational impact of this vulnerability is severe due to its association with administrative access controls. An unauthenticated attacker can leverage this flaw to gain unauthorized control over the entire WordPress installation and potentially the underlying server infrastructure. By extracting hashed passwords, an adversary may perform offline brute-force attacks to obtain plaintext credentials for other users or even system accounts if password reuse patterns exist across services. Furthermore, the ability to modify database records allows for persistent backdoors, such as creating new administrator accounts with known credentials that persist even after patches are applied unless explicitly removed. This level of compromise undermines the confidentiality, integrity, and availability of the web application ecosystem, leading to potential data breaches, defacement, or use of the compromised server as a pivot point for further network intrusions against internal assets.
This vulnerability aligns with Common Weakness Enumeration identifier CWE-89, which classifies Improper Neutralization of Special Elements used in an SQL Command, commonly known as SQL Injection. Additionally, it maps to MITRE ATT&CK technique T1059, specifically sub-techniques related to command and script interpretation or database query manipulation depending on the exact exploitation vector employed by the attacker during a real-world incident. The attack pattern often falls under Initial Access vectors where compromised credentials are used for lateral movement or persistence is established through backdoor creation within the application layer. Understanding these mappings helps security teams prioritize remediation efforts based on standardized risk assessment frameworks and threat intelligence models that track similar exploitation behaviors across different software ecosystems.
Mitigation strategies must focus on immediate patching of WPMasterToolKit to a version greater than 2.22.0 where this flaw has been addressed by the vendor through rigorous code review and security hardening measures. In scenarios where upgrading is not immediately feasible, temporary mitigations should include implementing Web Application Firewall rules that detect and block common SQL injection payloads targeting administrative endpoints. Input validation must be enforced at both the client-side for user experience enhancement and strictly on the server-side to ensure no malicious data reaches the database layer regardless of how it bypasses frontend checks. Developers should also adopt parameterized queries or prepared statements as a standard practice for all database interactions, ensuring that user input is treated exclusively as data rather than executable code. Regular security audits, static application security testing, and dynamic analysis during development lifecycles are essential to prevent recurrence of such critical flaws in future releases.