CVE-2025-8416: WordPress Product Filter SQLi Vulnerability

CVE-2025-8416 Overview

The Product Filter by WBW plugin for WordPress contains a SQL Injection vulnerability in the filtersDataBackend parameter affecting all versions up to and including 2.9.7. This vulnerability stems from insufficient escaping of user-supplied input and a lack of proper preparation on SQL queries, enabling unauthenticated attackers to manipulate database queries and extract sensitive information.

Critical Impact

Unauthenticated attackers can exploit this SQL Injection vulnerability to extract sensitive data from WordPress databases, potentially compromising user credentials, customer data, and other confidential information stored in WooCommerce installations.

Affected Products

• Product Filter by WBW for WordPress versions ≤ 2.9.7
• WooCommerce stores using the vulnerable woo-product-filter plugin
• WordPress installations with the affected plugin active

Discovery Timeline

• 2025-10-25 - CVE-2025-8416 published to NVD
• 2026-04-15 - Last updated in NVD database

Technical Details for CVE-2025-8416

Vulnerability Analysis

This SQL Injection vulnerability (CWE-89) affects the Product Filter by WBW WordPress plugin, which is commonly used to provide product filtering capabilities for WooCommerce stores. The vulnerable code resides in the filter handling mechanism, specifically within the filtersDataBackend parameter processing logic.

The vulnerability allows attackers to inject malicious SQL statements into database queries without requiring any authentication. Due to the plugin's role in filtering WooCommerce product data, successful exploitation grants attackers direct access to query the underlying WordPress database, which typically contains sensitive customer information, order details, and user credentials.

Root Cause

The root cause of this vulnerability is the failure to properly sanitize and escape user-supplied input before incorporating it into SQL queries. The filtersDataBackend parameter receives filter data from frontend requests but lacks sufficient input validation and parameterized query implementation. The vulnerable code paths can be observed in the plugin's controller and module files where filter data is processed and passed directly to database queries without using WordPress's prepared statement functions like $wpdb->prepare().

Attack Vector

The attack vector for CVE-2025-8416 is network-based, requiring no authentication or user interaction. An attacker can craft malicious HTTP requests containing SQL injection payloads in the filtersDataBackend parameter. When the plugin processes these requests, the injected SQL code is executed against the WordPress database. This allows attackers to:

1. Extract sensitive data from the WordPress database including user credentials and customer information
2. Enumerate database tables and columns to map the database structure
3. Access WooCommerce order data, payment information, and customer details
4. Potentially modify or delete data depending on database permissions

The vulnerability is exploited through the product filter AJAX endpoint, which processes filter requests for WooCommerce product listings. Technical details of the vulnerable code paths are available in the WordPress Plugin Code Overview and WordPress Plugin Module Code.

Detection Methods for CVE-2025-8416

Indicators of Compromise

• Unusual database query patterns in MySQL/MariaDB logs containing UNION SELECT, EXTRACTVALUE, or other SQL injection signatures
• HTTP requests to WordPress AJAX endpoints with abnormally long or encoded filtersDataBackend parameters
• Unexpected database errors in WordPress debug logs related to filter operations
• Signs of data exfiltration or unauthorized access to customer records

Detection Strategies

• Implement Web Application Firewall (WAF) rules to detect SQL injection patterns in requests to WooCommerce filter endpoints
• Monitor WordPress AJAX request logs for suspicious payloads containing SQL keywords in filter parameters
• Deploy database activity monitoring to alert on unusual query patterns or bulk data extraction attempts
• Enable WordPress debug logging temporarily to capture any SQL errors that may indicate exploitation attempts

Monitoring Recommendations

• Configure real-time alerting for SQL injection signatures in web server access logs
• Monitor database query response times and data transfer volumes for anomalies
• Set up file integrity monitoring for WordPress plugin files to detect any modifications
• Review authentication logs for signs of credential theft following potential database compromise

How to Mitigate CVE-2025-8416

Immediate Actions Required

• Update the Product Filter by WBW plugin to a patched version immediately
• If unable to update, temporarily deactivate the plugin until a patch can be applied
• Review database access logs for signs of exploitation during the vulnerable period
• Consider implementing a WAF rule to block suspicious requests to the filter endpoint

Patch Information

A security fix has been released for the Product Filter by WBW plugin. Administrators should update to the latest available version through the WordPress plugin repository. The patch details can be reviewed in the WordPress Plugin Change Log. Additional vulnerability details are available in the Wordfence Vulnerability Report.

Workarounds

• Temporarily disable the Product Filter by WBW plugin if immediate patching is not possible
• Implement WAF rules to block requests containing SQL injection patterns in the filtersDataBackend parameter
• Restrict database user privileges for the WordPress database to limit potential damage from exploitation
• Use a security plugin with SQL injection protection capabilities as an additional defense layer

# Configuration example - WordPress .htaccess rule to block suspicious filter requests
# Add to WordPress root .htaccess file as temporary mitigation
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteCond %{QUERY_STRING} filtersDataBackend.*(\%27|'|union|select|concat|extractvalue) [NC]
RewriteRule .* - [F,L]
</IfModule>