CVE-2025-31534: Shopper WordPress Plugin SQLi Vulnerability

CVE-2025-31534 Overview

CVE-2025-31534 is a critical SQL Injection vulnerability affecting the Shopper plugin for WordPress developed by shopperdotcom. The vulnerability stems from improper neutralization of special elements used in SQL commands (CWE-89), allowing unauthenticated attackers to inject malicious SQL queries through the vulnerable plugin. This flaw can result in unauthorized access to the database, potentially exposing sensitive customer and website data.

Critical Impact

Unauthenticated attackers can exploit this SQL Injection vulnerability to extract sensitive database information including user credentials, customer data, and potentially gain full database access on affected WordPress sites running Shopper plugin version 3.2.5 or earlier.

Affected Products

• WordPress Shopper Plugin versions up to and including 3.2.5
• WordPress sites with the Shopper plugin installed
• E-commerce platforms utilizing Shopper for WordPress

Discovery Timeline

• 2025-04-01 - CVE-2025-31534 published to NVD
• 2025-04-02 - Last updated in NVD database

Technical Details for CVE-2025-31534

Vulnerability Analysis

This SQL Injection vulnerability exists in the Shopper plugin for WordPress through version 3.2.5. The flaw allows attackers to manipulate SQL queries by injecting malicious input through user-controllable parameters that are not properly sanitized before being incorporated into database queries. The vulnerability is exploitable over the network without requiring any authentication or user interaction, making it particularly dangerous for publicly accessible WordPress sites.

The changed scope indicator suggests that successful exploitation can affect resources beyond the vulnerable component itself, potentially impacting other parts of the WordPress installation or underlying database infrastructure. The primary risk is high confidentiality impact, allowing attackers to extract sensitive information from the database.

Root Cause

The root cause of this vulnerability is the failure to properly sanitize user-supplied input before incorporating it into SQL queries. The Shopper plugin does not adequately validate or escape special characters in user input, allowing attackers to break out of the intended SQL query structure and inject their own malicious SQL commands. This is a classic SQL Injection flaw resulting from insufficient input validation and improper use of parameterized queries or prepared statements.

Attack Vector

The attack vector is network-based, meaning the vulnerability can be exploited remotely over the internet. Attackers can target any WordPress site running the vulnerable Shopper plugin by sending specially crafted requests containing malicious SQL payloads. The attack does not require authentication, privileges, or user interaction, making it accessible to any remote attacker who can reach the target website.

Common SQL Injection attack techniques that could be employed include:

• Union-based injection to extract data from other database tables
• Boolean-based blind injection to infer database contents
• Time-based blind injection using database sleep functions
• Error-based injection to extract data through error messages

For detailed technical information about this vulnerability, refer to the Patchstack Vulnerability Advisory.

Detection Methods for CVE-2025-31534

Indicators of Compromise

• Unusual database queries in WordPress logs containing SQL syntax like UNION SELECT, OR 1=1, or -- comment sequences
• Unexpected database errors or timeout responses from the WordPress site
• Signs of data exfiltration or unauthorized access to user account information
• Suspicious HTTP requests to Shopper plugin endpoints containing encoded or special characters

Detection Strategies

• Deploy Web Application Firewall (WAF) rules to detect and block common SQL Injection patterns in requests to the Shopper plugin
• Enable detailed logging on the WordPress database server to capture and analyze suspicious query patterns
• Implement SentinelOne Singularity to monitor for anomalous process behavior and potential post-exploitation activity on WordPress servers
• Utilize intrusion detection systems (IDS) to alert on SQL Injection attack signatures targeting WordPress installations

Monitoring Recommendations

• Monitor web server access logs for requests containing SQL injection payloads targeting Shopper plugin URLs
• Set up alerts for unusual database query volumes or patterns that may indicate automated SQL injection testing
• Track WordPress plugin versions across your environment to identify systems running vulnerable Shopper versions
• Configure database activity monitoring to detect unauthorized data access or extraction attempts

How to Mitigate CVE-2025-31534

Immediate Actions Required

• Audit your WordPress installations to identify any sites running the Shopper plugin version 3.2.5 or earlier
• Consider temporarily disabling or removing the Shopper plugin until a patched version is available and verified
• Implement Web Application Firewall rules to block SQL injection attempts targeting Shopper plugin endpoints
• Review database access logs for signs of exploitation and assess potential data exposure

Patch Information

Check the official Shopper plugin repository or the WordPress plugin directory for security updates addressing this vulnerability. Monitor the Patchstack Vulnerability Advisory for updates on available patches. Ensure that automatic updates are enabled for WordPress plugins where appropriate, and prioritize applying security patches for internet-facing applications.

Workarounds

• Deploy a Web Application Firewall (WAF) with SQL Injection detection rules to filter malicious requests before they reach the vulnerable plugin
• Restrict access to the WordPress admin panel and plugin endpoints by IP address where feasible
• Apply the principle of least privilege to database user accounts used by WordPress to limit the impact of successful SQL injection attacks
• Consider placing the affected WordPress site behind additional security controls or taking it offline if the plugin is not critical to operations

# Example WAF rule for ModSecurity to help block SQL injection attempts
# Add to your Apache or Nginx ModSecurity configuration
SecRule ARGS "@detectSQLi" "id:1001,phase:2,deny,status:403,msg:'SQL Injection attempt blocked'"