CVE-2025-4203 is a SQL Injection vulnerability classified under CWE-89 that affects the wpForo Forum plugin for WordPress, specifically versions up to and including 2.4.8. The vulnerability exists in the get_members() function, which accepts 'offset' and 'row_count' parameters intended to control pagination via a SQL LIMIT clause. The plugin uses esc_sql() to sanitize inputs but fails to enforce that 'row_count' and 'offset' are strictly numeric. MySQL 5.x syntax allows a PROCEDURE ANALYSE clause immediately following a LIMIT clause, which attackers can exploit by injecting malicious SQL through the 'row_count' parameter. Because the plugin does not validate or restrict this input, an unauthenticated attacker can append stored procedure calls that trigger error-based or time-based blind SQL injection. This enables attackers to extract sensitive information from the database, such as user data or configuration details, without requiring authentication or user interaction. The vulnerability has a CVSS 3.1 base score of 7.5, reflecting its high severity due to network attack vector, no privileges required, and no user interaction needed. While no public exploits are currently known, the vulnerability’s characteristics make it a prime candidate for exploitation. The lack of patches at the time of publication increases the urgency for mitigation. The wpForo Forum plugin is widely used in WordPress communities for forum management, making this vulnerability relevant to many websites globally, including those operated by European organizations.

For European organizations, exploitation of CVE-2025-4203 could lead to unauthorized disclosure of sensitive information stored in the database, such as user credentials, personal data, or internal configuration details. This compromises confidentiality and may violate GDPR and other data protection regulations, leading to legal and financial repercussions. Since the vulnerability does not affect integrity or availability directly, the primary risk is data leakage. However, attackers could leverage extracted information for further attacks, including privilege escalation or lateral movement. Organizations relying on wpForo for community engagement, customer support, or internal collaboration may face reputational damage and operational disruption if sensitive data is exposed. The ease of exploitation without authentication increases the threat level, especially for public-facing forums. Given the widespread use of WordPress and wpForo in Europe, the potential attack surface is significant, particularly for sectors with high regulatory scrutiny such as finance, healthcare, and government.

Immediate mitigation should focus on restricting access to the vulnerable get_members() function by implementing web application firewall (WAF) rules that detect and block SQL injection patterns, especially those targeting the 'row_count' and 'offset' parameters. Input validation should be enforced at the application level to ensure these parameters accept only numeric values, ideally integers within expected ranges. Organizations should monitor logs for suspicious queries involving PROCEDURE ANALYSE or unusual LIMIT clause manipulations. Until an official patch is released, consider disabling or restricting the wpForo Forum plugin if feasible, or isolating it behind additional security layers such as reverse proxies with strict input sanitization. Regular backups and database encryption can reduce the impact of potential data leaks. Security teams should also conduct vulnerability scanning and penetration testing focused on SQL injection vectors in WordPress environments. Finally, maintain awareness of vendor updates and apply patches promptly once available.