CVE-2026-2576: WordPress Business Directory Plugin SQLi

CVE-2026-2576 Overview

The Business Directory Plugin – Easy Listing Directories for WordPress is vulnerable to time-based SQL Injection via the payment parameter in all versions up to and including 6.4.2. This vulnerability arises due to insufficient escaping on the user-supplied parameter and lack of sufficient preparation on the existing SQL query. Unauthenticated attackers can exploit this flaw to append additional SQL queries into already existing queries, enabling extraction of sensitive information from the database.

Critical Impact

Unauthenticated attackers can extract sensitive database information including user credentials, payment data, and other confidential records stored in WordPress databases through time-based SQL injection techniques.

Affected Products

• Business Directory Plugin – Easy Listing Directories for WordPress versions up to and including 6.4.2

Discovery Timeline

• 2026-02-18 - CVE-2026-2576 published to NVD
• 2026-02-18 - Last updated in NVD database

Technical Details for CVE-2026-2576

Vulnerability Analysis

This vulnerability is classified as SQL Injection (CWE-89), one of the most dangerous web application security flaws. The vulnerability exists in the checkout processing functionality of the Business Directory Plugin, specifically in how the payment parameter is handled during database queries.

The attack can be executed over the network without any authentication requirements, making it particularly dangerous for WordPress sites running vulnerable versions of this plugin. Since the vulnerability affects the payment processing workflow, attackers can target e-commerce functionality to extract payment-related data and user information.

Time-based SQL injection allows attackers to infer information from the database by measuring response delays. By crafting malicious SQL statements that cause conditional time delays, attackers can extract data character by character without direct visibility of query results.

Root Cause

The root cause of this vulnerability is insufficient input sanitization and improper parameterization of SQL queries. The payment parameter in the checkout controller (class-checkout.php) is passed to database query functions without adequate escaping or prepared statement usage. The database query set class (class-db-query-set.php) fails to properly sanitize user input before incorporating it into SQL statements, allowing attackers to inject arbitrary SQL code.

Attack Vector

The attack vector is network-based, requiring no authentication or user interaction. An attacker can send specially crafted HTTP requests to the WordPress site's checkout endpoint, manipulating the payment parameter to inject malicious SQL code. The time-based nature of the injection means attackers use SQL commands like SLEEP() or BENCHMARK() to cause measurable delays that reveal database contents through inference.

The attack typically proceeds as follows: the attacker identifies the vulnerable payment parameter, injects SQL payloads containing time-delay functions conditional on data extraction queries, measures response times to determine if conditions are true or false, and iteratively extracts database contents character by character.

Detection Methods for CVE-2026-2576

Indicators of Compromise

• Unusual response time patterns on checkout-related endpoints, particularly requests taking significantly longer than normal
• HTTP requests to checkout pages containing SQL syntax characters such as single quotes, semicolons, or SQL keywords in the payment parameter
• Database logs showing unexpected SLEEP(), BENCHMARK(), or WAITFOR function calls
• Multiple sequential requests to the same endpoint with slight variations in parameter values indicating automated extraction attempts

Detection Strategies

• Implement Web Application Firewall (WAF) rules to detect SQL injection patterns in the payment parameter and related checkout endpoints
• Deploy database activity monitoring to identify unusual query patterns, particularly queries with time-delay functions
• Enable detailed WordPress access logging and analyze requests for SQL injection signatures
• Configure intrusion detection systems (IDS) to alert on timing-based attack patterns

Monitoring Recommendations

• Monitor checkout endpoint response times for statistical anomalies that may indicate time-based injection attempts
• Track failed and unusual database query patterns in MySQL/MariaDB slow query logs
• Implement real-time alerting for requests containing SQL injection attack signatures
• Review WordPress audit logs for suspicious activity around payment processing functionality

How to Mitigate CVE-2026-2576

Immediate Actions Required

• Update Business Directory Plugin to version 6.4.21 or later immediately
• Review database access logs for evidence of exploitation attempts
• Consider temporarily disabling the plugin if immediate update is not possible
• Audit database contents for signs of data exfiltration, particularly user credentials and payment information

Patch Information

The vulnerability has been addressed in the plugin codebase. The fix can be reviewed in the WordPress Plugin Changeset which shows the modifications made to class-db-query-set.php to properly sanitize and prepare SQL queries. Additional technical details are available in the Wordfence Vulnerability Report.

Workarounds

• Deploy a Web Application Firewall (WAF) with SQL injection protection rules targeting the checkout endpoints
• Implement server-side input validation to block requests containing SQL injection patterns in the payment parameter
• Restrict access to WordPress administrative and checkout functionality via IP allowlisting if feasible
• Consider using WordPress security plugins like Wordfence to add additional protection layers while awaiting patch deployment

# Example: Block suspicious requests at the web server level (Apache)
# Add to .htaccess in WordPress root
RewriteEngine On
RewriteCond %{QUERY_STRING} (payment=.*(\%27|\'|SLEEP|BENCHMARK|WAITFOR)) [NC]
RewriteRule .* - [F,L]