CVE-2025-4485 is a critical SQL Injection vulnerability identified in version 1.0 of the itsourcecode Gym Management System. The vulnerability exists in the /ajax.php endpoint when the 'action' parameter is set to 'delete_trainer' and the 'ID' argument is manipulated. This allows an unauthenticated remote attacker to inject malicious SQL code due to insufficient input validation or sanitization of the 'ID' parameter. Exploiting this flaw could enable attackers to execute arbitrary SQL commands against the backend database, potentially leading to unauthorized data access, data modification, or deletion. The vulnerability is remotely exploitable without requiring any authentication or user interaction, increasing its risk profile. Although the CVSS 4.0 score is 6.9 (medium severity), the nature of SQL injection vulnerabilities often allows for significant impact, including data breach or disruption of service. No patches or fixes have been publicly disclosed yet, and no known exploits are reported in the wild at this time. The vulnerability was publicly disclosed on May 9, 2025, making it critical for affected organizations to assess and mitigate promptly.

For European organizations using the itsourcecode Gym Management System version 1.0, this vulnerability poses a significant risk to the confidentiality, integrity, and availability of their data. Gym management systems typically store sensitive personal information such as member details, payment information, health data, and scheduling records. Exploitation could lead to unauthorized disclosure of personal data, violating GDPR regulations and resulting in legal and financial penalties. Additionally, attackers could manipulate or delete critical data, disrupting business operations and damaging reputation. The remote, unauthenticated nature of the exploit increases the likelihood of automated attacks or mass scanning by threat actors. Given the fitness industry's growth in Europe and the increasing digitization of health and membership data, this vulnerability could affect a broad range of organizations from small gyms to large fitness chains, especially those that have not updated or patched their systems. The absence of known exploits currently provides a window for proactive mitigation, but the public disclosure increases the risk of future exploitation.

European organizations should immediately conduct an inventory to identify any deployments of itsourcecode Gym Management System version 1.0. Since no official patch is currently available, organizations should implement the following specific mitigations: 1) Apply Web Application Firewall (WAF) rules to detect and block SQL injection attempts targeting the /ajax.php?action=delete_trainer endpoint, specifically filtering suspicious 'ID' parameter inputs. 2) Employ input validation and sanitization at the application layer if source code access is available, ensuring that the 'ID' parameter only accepts strictly validated numeric or expected values. 3) Restrict access to the vulnerable endpoint by IP whitelisting or VPN access where feasible to limit exposure. 4) Monitor logs for unusual or repeated requests to the vulnerable endpoint to detect potential exploitation attempts early. 5) Plan for an urgent update or migration to a patched version once available from the vendor. 6) Educate IT and security teams about this vulnerability and ensure incident response plans include steps for SQL injection detection and containment. These targeted actions go beyond generic advice by focusing on the specific vulnerable endpoint and attack vector.