CVE-2026-4550 identifies a SQL injection vulnerability in the Simple Gym Management System version 1.0 developed by code-projects. The vulnerability resides in the /gym/func.php file, specifically through improper sanitization of the Trainer_id and fname parameters. An attacker can remotely manipulate these input parameters to inject malicious SQL code, potentially enabling unauthorized access to or modification of the underlying database. The vulnerability does not require user interaction but does require high privileges, indicating that some form of authentication or elevated access may be necessary to exploit it. The CVSS 4.0 vector indicates network attack vector (AV:N), low attack complexity (AC:L), no privileges required (PR:H means high privileges required, but the vector states PR:H, so high privileges are needed), no user interaction (UI:N), and low impact on confidentiality, integrity, and availability (VC:L, VI:L, VA:L). The scope is unchanged (S:U), and the exploit code has been publicly disclosed, increasing the likelihood of exploitation. No patches or fixes are currently linked, and no known exploits are reported in the wild. The vulnerability could allow attackers to extract sensitive data, modify records, or disrupt gym management operations if exploited successfully.

The SQL injection vulnerability in the Simple Gym Management System could lead to unauthorized data access, data manipulation, or deletion within the gym management database. This can compromise member information, trainer details, scheduling data, and potentially payment or billing records if stored in the same database. The integrity of gym operations could be affected, leading to service disruptions or loss of trust from customers. Although exploitation requires high privileges, if an attacker gains such access, the impact could extend to full database compromise. Organizations relying on this software may face data breaches, regulatory compliance issues, and operational downtime. The public disclosure of the exploit increases the risk of opportunistic attacks, especially if no mitigations are applied. The medium CVSS score reflects moderate risk but should not be underestimated given the sensitive nature of personal and financial data managed by gym systems.

To mitigate CVE-2026-4550, organizations should first check for any vendor patches or updates and apply them promptly once available. In the absence of official patches, immediate steps include implementing strict input validation and sanitization on all user-supplied parameters, especially Trainer_id and fname, to prevent injection of malicious SQL code. Refactoring the application code to use parameterized queries or prepared statements is critical to eliminate SQL injection risks. Additionally, database user privileges should be minimized, ensuring the application account has only necessary permissions to limit potential damage. Network-level protections such as web application firewalls (WAFs) can be configured to detect and block SQL injection attempts. Regular security audits and code reviews should be conducted to identify similar vulnerabilities. Monitoring logs for unusual database queries or errors can help detect exploitation attempts early. Finally, educating developers on secure coding practices will reduce future vulnerabilities.