CVE-2026-18032 in WP Data Access Plugin
Summary
by MITRE • 08/09/2026
The WP Data Access WordPress plugin before 5.5.79 does not validate the column names it accepts on one of its unauthenticated AJAX actions, and the nonce guarding that action does not cover them, allowing unauthenticated attackers to read arbitrary columns of the database table the affected front-end form is bound to, including user password hashes where that table is the users table.
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Analysis
by VulDB Data Team • 08/09/2026
The WP Data Access WordPress plugin vulnerability represents a critical security flaw that undermines the integrity of database access controls within WordPress environments. This issue affects versions prior to 5.5.79 and stems from insufficient input validation mechanisms within one of the plugin's unauthenticated ajax endpoints. The vulnerability specifically targets column name validation processes, where the plugin fails to properly sanitize or validate the column names it accepts through the affected interface. This weakness exists in conjunction with nonce validation that does not adequately cover the column name parameters, creating a pathway for unauthorized data access.
The technical implementation of this vulnerability allows attackers to exploit the lack of proper parameter validation by submitting arbitrary column names through the unauthenticated ajax action. When the plugin processes these requests, it directly uses the supplied column names without sufficient sanitization or authorization checks. The impact is particularly severe when the affected form is bound to the WordPress users table, as this enables attackers to extract sensitive information including password hashes that are typically stored in database columns accessible through such interfaces. This represents a fundamental breakdown in the principle of least privilege where unauthorized users can access data they should not be permitted to view.
The operational implications of this vulnerability extend beyond simple data exposure, as it provides attackers with potential access to credentials and user account information that could facilitate further compromise of WordPress installations. The fact that this affects an unauthenticated endpoint means attackers do not require valid user credentials or administrative privileges to exploit the vulnerability. This creates a significant risk for websites relying on the WP Data Access plugin, particularly those hosting sensitive user data or operating in environments where database security is paramount. The vulnerability aligns with common attack patterns documented in the attack technique framework where unauthorized data access represents a primary objective for threat actors.
From a compliance and security standards perspective, this vulnerability directly relates to CWE-20 (Improper Input Validation) and CWE-693 (Protection Mechanism Failure), both of which are categorized under the broader domain of weak input validation and protection mechanism failures. The issue also maps to ATT&CK technique T1213.002 (Data from Information Repositories) as it enables unauthorized access to database repositories through compromised application interfaces. Organizations using affected versions should immediately implement mitigations including patching to version 5.5.79 or higher, implementing additional access controls for ajax endpoints, and conducting thorough security reviews of plugin configurations. The vulnerability demonstrates the critical importance of validating all inputs regardless of authentication status and highlights the necessity of comprehensive nonce validation that covers all parameter types within web application interfaces.
The remediation approach requires immediate patching of the WP Data Access plugin to version 5.5.79 or later, which addresses the column name validation issue and strengthens the nonce protection mechanisms. Additionally, administrators should review and restrict access to ajax endpoints through server-level configurations, implement proper input sanitization for all database query parameters, and conduct regular security assessments of third-party plugins. Organizations should also consider implementing network-level protections such as web application firewalls that can detect and block suspicious parameter patterns targeting database access interfaces. The vulnerability serves as a reminder of the critical need for robust validation mechanisms at all levels of web application architecture, particularly in interfaces that handle database operations without proper authentication requirements.
The broader security implications highlight that similar vulnerabilities may exist in other WordPress plugins that implement unauthenticated ajax functionality without comprehensive input validation. This underscores the importance of maintaining updated security practices and regularly reviewing plugin security configurations. The vulnerability also emphasizes the need for proper security testing during plugin development, particularly focusing on parameter handling in publicly accessible interfaces. Organizations should establish clear policies regarding plugin security reviews and maintain up-to-date inventory of all installed plugins to quickly identify and remediate similar vulnerabilities across their digital infrastructure.