CVE-2026-96826 in W4 Post List Plugin
Summary
by MITRE • 09/23/2026
Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection') vulnerability in Shazzad Hossain Khan W4 Post List allows Blind SQL Injection.
This issue affects W4 Post List: from n/a through 3.0.6.
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Analysis
by VulDB Data Team • 09/23/2026
The identified security flaw represents a classic instance of Improper Neutralization of Special Elements used in an SQL Command, commonly referred to as SQL injection. This vulnerability is present within the W4 Post List plugin developed by Shazzad Hossain Khan, specifically affecting versions ranging from n/a through 3.0.6. The core technical deficiency lies in the application's failure to properly sanitize or validate user-supplied input before incorporating it into backend database queries. When a WordPress site utilizes this plugin to display post lists, any parameter that is passed by an external actor and subsequently used in constructing SQL statements without adequate escaping mechanisms creates a pathway for malicious code execution within the database layer.
The specific manifestation of this vulnerability is categorized as Blind SQL Injection. Unlike standard injection attacks where error messages or query results are directly returned to the attacker, allowing immediate confirmation of success, blind injections require the attacker to infer data through indirect means. The application does not return detailed database errors that reveal structural information about the underlying schema. Instead, the attacker must rely on time-based delays or boolean-based logic changes in the HTTP response to deduce whether a specific condition is true or false. This method necessitates more sophisticated exploitation techniques but remains highly effective for extracting sensitive data from the database over multiple requests.
From an operational impact perspective, this vulnerability poses severe risks to the integrity and confidentiality of the targeted WordPress environment. An authenticated attacker with low privileges can exploit this flaw to extract critical information stored in the MySQL database. This includes administrative usernames and password hashes, which can be cracked offline to gain full control of the website. Furthermore, the attacker may access sensitive user data such as email addresses and personal identification details if they are stored within the post metadata or associated tables. In more advanced scenarios, depending on the database configuration and privileges granted to the web application's database user, this could potentially lead to remote code execution by writing malicious files to the server filesystem via SQL commands like INTO OUTFILE, thereby compromising the entire hosting infrastructure.
This vulnerability aligns with CWE-89, which defines Improper Neutralization of Special Elements used in an SQL Command. It also maps directly to MITRE ATT&CK technique T1059.004, specifically Subcommand: SQL Commands, under the broader category of Execution and Collection techniques. The exploitation path typically involves manipulating query parameters that control how posts are filtered or sorted within the list view provided by the plugin. By injecting carefully crafted payloads into these input fields, an attacker can alter the logic of the underlying SELECT statement to perform unauthorized data retrieval operations.
To mitigate this risk, immediate action is required for all administrators running versions of W4 Post List up to 3.0.6. The primary remediation step is to upgrade the plugin to a patched version where the developer has implemented proper input validation and parameterized queries or prepared statements that ensure user input is treated strictly as data rather than executable code. Until an update is available, administrators should consider disabling the plugin if it is not essential for their site's functionality. Additionally, implementing a Web Application Firewall can provide a layer of defense by detecting and blocking common SQL injection patterns in HTTP requests before they reach the application logic. Regular security audits and adherence to secure coding practices that emphasize input sanitization are critical preventive measures against such vulnerabilities in future development cycles.