CVE-2026-3754 is a SQL injection vulnerability identified in SourceCodester Sales and Inventory System version 1.0, specifically in the /add_stock.php script. The vulnerability stems from improper handling of the 'cost' parameter, which is directly incorporated into SQL queries without adequate sanitization or parameterization. This flaw allows remote attackers to inject malicious SQL code by manipulating the 'cost' argument, potentially enabling unauthorized access to or modification of the underlying database. The vulnerability requires no authentication or user interaction, increasing its risk profile. The CVSS 4.0 base score is 5.3, reflecting a medium severity due to the limited scope of impact and the requirement for some privileges (PR:L). The vulnerability affects the confidentiality, integrity, and availability of the system's data, though the scope is limited to the affected component. No official patches have been linked yet, but the public disclosure of exploit code increases the risk of exploitation. The vulnerability is particularly concerning for organizations relying on this software for inventory and sales management, as attackers could manipulate stock data or extract sensitive business information.

The SQL injection vulnerability can lead to unauthorized data disclosure, data manipulation, or deletion within the affected database, compromising the confidentiality, integrity, and availability of critical business data. Attackers could potentially extract sensitive customer or financial information, alter inventory records, or disrupt sales operations. This could result in financial losses, reputational damage, and regulatory compliance issues for affected organizations. Since the vulnerability can be exploited remotely without authentication, any internet-facing deployment of the vulnerable system is at risk. The medium severity rating indicates a moderate but tangible threat, especially for small and medium enterprises that may lack robust security controls. The absence of known active exploits currently reduces immediate risk but the public availability of exploit code increases the likelihood of future attacks.

1. Apply official patches or updates from SourceCodester as soon as they become available to address the vulnerability directly. 2. If patches are not yet available, implement immediate input validation and sanitization on the 'cost' parameter in /add_stock.php to ensure only valid numeric values are accepted. 3. Refactor the code to use parameterized queries or prepared statements to prevent SQL injection. 4. Employ web application firewalls (WAFs) with SQL injection detection and prevention rules to block malicious payloads targeting this vulnerability. 5. Conduct thorough security testing and code reviews of all input handling routines in the application to identify and remediate similar injection flaws. 6. Restrict access to the affected system to trusted networks or VPNs to reduce exposure. 7. Monitor logs for suspicious SQL query patterns or unusual database activity indicative of exploitation attempts. 8. Educate development teams on secure coding practices to prevent future injection vulnerabilities.