CVE-2025-4484 is a critical SQL Injection vulnerability identified in version 1.0 of the itsourcecode Gym Management System. The flaw resides in the /ajax.php endpoint, specifically in the 'delete_user' action, where the 'ID' parameter is improperly sanitized. This allows an unauthenticated remote attacker to inject malicious SQL code through the 'ID' argument, potentially manipulating the backend database. The vulnerability can be exploited without any user interaction or authentication, making it highly accessible to attackers. The injection could lead to unauthorized data access, modification, or deletion, impacting the confidentiality, integrity, and availability of the system's data. Although no public exploits are currently known in the wild, the vulnerability has been publicly disclosed, increasing the risk of exploitation. The CVSS 4.0 score is 6.9 (medium severity), reflecting the network attack vector, low attack complexity, and no required privileges or user interaction, but with limited impact on confidentiality, integrity, and availability. The vulnerability affects only version 1.0 of the product, and no official patches or mitigations have been published yet.

For European organizations using the itsourcecode Gym Management System 1.0, this vulnerability poses a significant risk. Gym management systems typically store sensitive personal data such as member identities, contact details, payment information, and health-related data. Exploitation could lead to data breaches exposing personal and financial information, violating GDPR and other data protection regulations, resulting in legal penalties and reputational damage. Additionally, attackers could manipulate or delete user records, disrupting business operations and service availability. Given the remote and unauthenticated nature of the vulnerability, attackers can easily target exposed systems over the internet. This risk is heightened for smaller gyms or fitness centers that may lack robust cybersecurity measures. The absence of patches means organizations must rely on compensating controls until an official fix is released.

European organizations should immediately conduct an inventory to identify any deployments of itsourcecode Gym Management System version 1.0. If found, they should restrict access to the affected /ajax.php endpoint by implementing network-level controls such as IP whitelisting or VPN access to limit exposure. Web application firewalls (WAFs) should be configured with custom rules to detect and block SQL injection attempts targeting the 'ID' parameter in the 'delete_user' action. Input validation and parameterized queries should be implemented as soon as possible by applying vendor patches or custom code fixes. Until patches are available, monitoring logs for suspicious activity related to the vulnerable endpoint is critical. Organizations should also review and enhance database user permissions to minimize the impact of potential SQL injection attacks. Finally, regular backups of the database should be maintained to enable recovery from data manipulation or deletion.