CVE-2025-15243 identifies a SQL injection vulnerability in the Simple Stock System version 1.0 developed by code-projects. The flaw resides in the /market/login.php file, where the Username parameter is improperly sanitized, allowing an attacker to inject malicious SQL code remotely without requiring authentication or user interaction. This vulnerability enables attackers to manipulate backend database queries, potentially extracting sensitive information, modifying data, or disrupting database operations. The CVSS 4.0 score of 6.9 reflects a medium severity, considering the attack vector is network-based with low complexity and no privileges or user interaction required, but with limited impact on confidentiality, integrity, and availability. Although no active exploits have been observed in the wild, the public availability of exploit code increases the risk of exploitation. The vulnerability affects only version 1.0 of the product, which is typically used by small to medium-sized enterprises for stock management. The lack of vendor patches or official mitigation guidance necessitates immediate defensive actions by users. This vulnerability exemplifies common risks in web applications that fail to properly validate user inputs, particularly in authentication modules, which are critical for system security.

For European organizations, exploitation of this SQL injection vulnerability could lead to unauthorized access to sensitive inventory and user data, potentially resulting in data breaches and compliance violations under GDPR. Integrity of stock records could be compromised, affecting business operations and financial reporting. Availability might also be impacted if attackers execute destructive SQL commands or cause database errors, leading to downtime. Small and medium enterprises relying on Simple Stock System for inventory management could face operational disruptions, reputational damage, and financial losses. The risk is heightened by the remote, unauthenticated nature of the attack, allowing attackers to target exposed systems over the internet. Additionally, the publication of exploit code increases the likelihood of opportunistic attacks. Organizations in sectors with stringent data protection requirements or critical supply chains may experience amplified consequences.

Organizations should immediately audit their use of Simple Stock System version 1.0 and isolate affected instances from public networks where possible. Implement input validation and sanitization for the Username parameter in /market/login.php, ideally by refactoring the code to use parameterized queries or prepared statements to prevent SQL injection. If vendor patches become available, apply them promptly. Employ web application firewalls (WAFs) with rules to detect and block SQL injection attempts targeting the login endpoint. Conduct regular security assessments and code reviews of custom or third-party applications. Monitor logs for suspicious login attempts or unusual database errors. Restrict database user permissions to the minimum necessary to limit the impact of potential exploitation. Consider migrating to alternative, actively maintained stock management solutions if patching is not feasible. Finally, ensure backups are current and tested to enable recovery in case of data corruption or loss.