CVE-2025-8156 is a SQL Injection vulnerability identified in PHPGurukul User Registration & Login and User Management version 3.3. The vulnerability exists in the file /admin/lastsevendays-reg-users.php, specifically through the manipulation of the 'ID' parameter. This parameter is not properly sanitized or validated, allowing an attacker to inject malicious SQL code. The vulnerability can be exploited remotely without requiring user interaction or authentication, making it accessible to unauthenticated attackers over the network. The SQL Injection flaw could allow an attacker to read, modify, or delete data within the backend database, potentially compromising user data, including sensitive registration and login information. The CVSS 4.0 base score is 5.3, indicating a medium severity level, reflecting limited impact on confidentiality, integrity, and availability, and requiring low privileges but no user interaction. Although no public exploits are currently known in the wild, the vulnerability has been publicly disclosed, increasing the risk of exploitation. The absence of an official patch or mitigation guidance from the vendor at this time further elevates the risk for users of this software. Given the critical role of user management systems in web applications, exploitation could lead to unauthorized access, data leakage, or further compromise of the hosting environment.

For European organizations using PHPGurukul User Registration & Login and User Management version 3.3, this vulnerability poses a significant risk to the confidentiality and integrity of user data. Exploitation could lead to unauthorized access to personal data, which is particularly sensitive under the GDPR framework, potentially resulting in regulatory penalties and reputational damage. The ability to remotely exploit the vulnerability without authentication increases the threat level, especially for organizations with externally accessible administrative interfaces. Compromise of user management systems can also serve as a foothold for further attacks within the network, including privilege escalation and lateral movement. Organizations relying on this software for customer or employee identity management could face service disruption or data breaches, impacting business continuity and trust. The medium CVSS score suggests a moderate but non-negligible impact, emphasizing the need for timely mitigation to prevent exploitation.

1. Immediate mitigation should include restricting access to the /admin/lastsevendays-reg-users.php endpoint via network controls such as IP whitelisting or VPN-only access to limit exposure. 2. Implement web application firewall (WAF) rules specifically designed to detect and block SQL injection attempts targeting the 'ID' parameter. 3. Conduct a thorough code review and apply input validation and parameterized queries or prepared statements to sanitize all user inputs, especially the 'ID' parameter in the affected script. 4. Monitor application logs for suspicious SQL query patterns or repeated access attempts to the vulnerable endpoint. 5. If possible, isolate the affected application environment to minimize lateral movement risks. 6. Engage with the vendor or community to obtain or develop a security patch and apply it as soon as available. 7. Perform regular vulnerability scanning and penetration testing focused on injection flaws to detect similar issues proactively. 8. Educate development and operations teams on secure coding practices to prevent recurrence of injection vulnerabilities.