CVE-2026-4079: Guaven SQL Chart Builder SQLi Vulnerability

CVE-2026-4079 Overview

CVE-2026-4079 is a SQL Injection vulnerability affecting the SQL Chart Builder WordPress plugin developed by Guaven. The plugin fails to properly escape user input when concatenating values to SQL queries, allowing attackers to conduct SQL Injection attacks against the dynamic filter functionality. This vulnerability affects all versions of the plugin prior to 2.3.8.

Critical Impact

Unauthenticated attackers can exploit the SQL Injection flaw in the dynamic filter functionality to extract sensitive data from the WordPress database, potentially compromising user credentials, site configuration, and stored content.

Affected Products

• Guaven SQL Chart Builder for WordPress (versions before 2.3.8)

Discovery Timeline

• 2026-04-07 - CVE-2026-4079 published to NVD
• 2026-04-09 - Last updated in NVD database

Technical Details for CVE-2026-4079

Vulnerability Analysis

This SQL Injection vulnerability (CWE-89) exists in the SQL Chart Builder WordPress plugin's dynamic filter functionality. The plugin accepts user-supplied input for filtering chart data but fails to implement proper input sanitization or parameterized queries before incorporating the values into SQL statements.

The vulnerability is network-exploitable without requiring authentication, making it accessible to remote attackers. Successful exploitation could allow unauthorized read and write access to the WordPress database, though availability impact is limited based on the vulnerability characteristics.

Root Cause

The root cause stems from improper input validation and the direct concatenation of user-supplied data into SQL query strings. Instead of using prepared statements with parameterized queries—which is the recommended practice for WordPress plugin development—the plugin directly embeds filter parameters into raw SQL queries. This failure to sanitize or escape special characters allows attackers to break out of the intended query context and inject arbitrary SQL commands.

Attack Vector

The vulnerability is exploited via network-based requests targeting the dynamic filter functionality of the SQL Chart Builder plugin. An attacker can craft malicious filter parameters containing SQL metacharacters and injection payloads. When these parameters are processed by the vulnerable code path, the injected SQL commands are executed against the WordPress database.

Attack scenarios include:

• Extracting sensitive data from wp_users table including password hashes
• Enumerating database structure and table contents
• Modifying existing data if the database user has write permissions
• Potentially escalating access through stored procedure calls or database-specific features

For detailed technical information about this vulnerability, refer to the WPScan Vulnerability Report.

Detection Methods for CVE-2026-4079

Indicators of Compromise

• Unusual SQL error messages appearing in WordPress error logs or displayed to users
• Web server access logs containing suspicious characters in request parameters such as single quotes, semicolons, UNION, SELECT, or comment sequences (--, /**/)
• Database logs showing unexpected or malformed queries originating from the SQL Chart Builder plugin
• Evidence of bulk data extraction or unusual database read patterns

Detection Strategies

• Deploy Web Application Firewall (WAF) rules to detect and block SQL Injection patterns in HTTP requests targeting WordPress plugin endpoints
• Monitor WordPress database query logs for anomalous SQL statements containing injection signatures
• Implement intrusion detection signatures for common SQL Injection payloads targeting the plugin's filter parameters
• Review access logs for repeated requests with varying SQL injection test patterns indicating active exploitation attempts

Monitoring Recommendations

• Enable detailed WordPress debug logging to capture plugin-related database errors
• Configure database auditing to track queries executed by the WordPress database user
• Set up alerts for any SQL error rate spikes that may indicate exploitation attempts
• Monitor for unauthorized changes to WordPress user accounts or permissions

How to Mitigate CVE-2026-4079

Immediate Actions Required

• Update the SQL Chart Builder plugin to version 2.3.8 or later immediately
• Review WordPress database logs for signs of prior exploitation
• Audit WordPress user accounts for unauthorized modifications or new administrative users
• Consider temporarily deactivating the plugin until the update can be applied if immediate patching is not possible

Patch Information

Guaven has addressed this vulnerability in SQL Chart Builder version 2.3.8. Administrators should update to this version or later through the WordPress plugin management interface or by downloading the patched version from the WordPress plugin repository. After updating, verify the plugin version is correctly reflected in the WordPress admin panel.

For additional details, see the WPScan Vulnerability Report.

Workarounds

• Temporarily disable the SQL Chart Builder plugin if immediate patching is not feasible
• Implement WAF rules to block SQL Injection patterns in requests to WordPress
• Restrict access to the WordPress admin area and plugin functionality to trusted IP addresses
• Apply principle of least privilege to the WordPress database user to limit potential damage from SQL Injection

# Configuration example: WordPress .htaccess rules to block common SQL Injection patterns
# Add to your WordPress .htaccess file as a temporary mitigation

<IfModule mod_rewrite.c>
RewriteEngine On
RewriteCond %{QUERY_STRING} (\%27)|(\')|(\-\-)|(\%23)|(#) [NC]
RewriteRule .* - [F]
RewriteCond %{QUERY_STRING} (union|select|insert|drop|update|delete|concat) [NC]
RewriteRule .* - [F]
</IfModule>