CVE-2026-3830: WooCommerce Product Filter SQLi Vulnerability

CVE-2026-3830 Overview

A SQL injection vulnerability exists in the Product Filter for WooCommerce by WBW WordPress plugin before version 3.1.3. The plugin fails to properly sanitize and escape a parameter before incorporating it into a SQL statement, enabling unauthenticated users to perform SQL injection attacks. This vulnerability allows remote attackers to extract sensitive data from the WordPress database without requiring any authentication.

Critical Impact

Unauthenticated attackers can exploit this SQL injection flaw to extract sensitive database contents including user credentials, customer data, and order information from WooCommerce stores.

Affected Products

• Product Filter for WooCommerce by WBW plugin versions prior to 3.1.3
• WordPress installations using vulnerable versions of the plugin
• WooCommerce stores with the affected plugin installed

Discovery Timeline

• 2026-04-13 - CVE CVE-2026-3830 published to NVD
• 2026-04-15 - Last updated in NVD database

Technical Details for CVE-2026-3830

Vulnerability Analysis

This vulnerability is classified as CWE-89 (SQL Injection), a critical class of web application security flaws. The Product Filter for WooCommerce plugin processes user-supplied input without adequate sanitization before constructing SQL queries. When an attacker submits malicious input through the vulnerable parameter, the unsanitized data is directly concatenated into the SQL statement, allowing the attacker to manipulate database queries.

The network-accessible nature of this vulnerability means attackers can exploit it remotely without any prior authentication. The scope change in the vulnerability indicates that while the vulnerable component is the WordPress plugin, the impact extends to the underlying database system, potentially compromising confidentiality of all data stored within the WordPress database.

Root Cause

The root cause of this vulnerability is improper input validation and the failure to use parameterized queries or prepared statements. The plugin directly incorporates user-supplied input into SQL queries without proper escaping or sanitization. WordPress provides built-in functions such as $wpdb->prepare() for safe database query construction, but these were not properly utilized in the vulnerable code path.

Attack Vector

The attack vector is network-based, requiring no user interaction or special privileges. An unauthenticated remote attacker can craft malicious HTTP requests containing SQL injection payloads targeting the vulnerable parameter. The attack can be executed through standard web requests to the WordPress site, making it easily exploitable from anywhere on the internet.

The vulnerability allows attackers to:

• Extract sensitive data from the WordPress database through UNION-based or blind SQL injection techniques
• Enumerate database tables, columns, and contents
• Access user credentials, customer information, and WooCommerce order data
• Potentially escalate to more severe attacks depending on database permissions

Detection Methods for CVE-2026-3830

Indicators of Compromise

• Anomalous HTTP requests containing SQL syntax characters such as single quotes, UNION statements, or SQL comments in request parameters
• Unexpected database query patterns or errors in WordPress debug logs
• Unusual access patterns to WooCommerce filter functionality from suspicious IP addresses
• Evidence of data exfiltration or bulk database enumeration in server logs

Detection Strategies

• Implement Web Application Firewall (WAF) rules to detect and block SQL injection patterns in request parameters
• Monitor WordPress and web server access logs for requests containing SQL injection signatures
• Deploy database activity monitoring to detect unusual query patterns or unauthorized data access
• Use security plugins that provide SQL injection detection capabilities for WordPress installations

Monitoring Recommendations

• Enable WordPress debug logging and review logs regularly for database query errors
• Configure intrusion detection systems (IDS) to alert on SQL injection attempt signatures
• Monitor for unusual outbound data transfers that may indicate successful data exfiltration
• Set up alerts for failed authentication attempts following potential SQL injection activity

How to Mitigate CVE-2026-3830

Immediate Actions Required

• Update the Product Filter for WooCommerce by WBW plugin to version 3.1.3 or later immediately
• Review WordPress and database logs for evidence of prior exploitation attempts
• Consider temporarily disabling the vulnerable plugin until patching is complete
• Implement WAF rules to block SQL injection attempts as an additional layer of defense

Patch Information

The vendor has addressed this vulnerability in version 3.1.3 of the Product Filter for WooCommerce by WBW plugin. Administrators should update to this version or later through the WordPress plugin update mechanism. For detailed vulnerability information, refer to the WPScan Vulnerability Report.

Workarounds

• Deploy a Web Application Firewall (WAF) with SQL injection protection rules as a temporary mitigation measure
• Restrict access to the WordPress admin area and plugin functionality from untrusted networks
• Implement database user permissions following the principle of least privilege to limit potential damage
• Consider disabling the affected plugin functionality until the patch can be applied

# WordPress CLI command to update the plugin
wp plugin update product-filter-for-woocommerce-by-wbw

# Verify installed plugin version
wp plugin list --name=product-filter-for-woocommerce-by-wbw --fields=name,version,status