CVE-2026-4550 is a SQL injection vulnerability identified in the Simple Gym Management System developed by code-projects, specifically affecting version 1.0. The vulnerability resides in the /gym/func.php file, where the application improperly sanitizes or validates input parameters Trainer_id and fname. An attacker can remotely manipulate these parameters to inject arbitrary SQL queries into the backend database. This injection flaw allows unauthorized attackers to execute unintended SQL commands, potentially leading to unauthorized data retrieval, modification, or deletion. The vulnerability does not require user interaction but does require the attacker to have high privileges (PR:H) on the system, which may limit exploitation to insiders or users with elevated access. The CVSS 4.0 base score is 5.1, reflecting a medium severity level due to limited scope and required privileges. No patches or official fixes have been published yet, and no known exploits are currently active in the wild, though the exploit details have been publicly disclosed. This vulnerability highlights the importance of proper input validation and parameterized queries to prevent SQL injection attacks in web applications.

If exploited, this SQL injection vulnerability could allow attackers to access sensitive information stored in the gym management system's database, such as personal data of gym members and trainers. Attackers might also modify or delete data, disrupting business operations and damaging data integrity. Given the requirement for high privileges, the threat is more significant in environments where users have elevated access or where privilege escalation is possible. The remote exploitability increases the attack surface, especially for organizations exposing the application to the internet. This could lead to data breaches, regulatory non-compliance, reputational damage, and operational downtime. Organizations relying on this software for managing client and trainer information are at risk of unauthorized data exposure and potential manipulation of critical business data.

Organizations should immediately review access controls to ensure that only trusted users have high privileges within the Simple Gym Management System. Implement strict input validation and use parameterized queries or prepared statements to prevent SQL injection. Since no official patch is currently available, consider applying web application firewalls (WAFs) with custom rules to detect and block SQL injection attempts targeting Trainer_id and fname parameters. Conduct thorough code audits focusing on all user inputs in /gym/func.php and related modules. Limit exposure by restricting network access to the application, especially from untrusted sources. Monitor logs for suspicious database query patterns or failed injection attempts. Plan to upgrade or replace the software once a vendor patch is released. Additionally, educate developers and administrators about secure coding practices and the risks of SQL injection.