CVE-2026-0591 identifies a SQL injection vulnerability in the Online Product Reservation System version 1.0 developed by code-projects. The vulnerability resides in the /app/checkout/update.php script, specifically within the Cart Update Handler component. Attackers can manipulate the id and qty parameters, which are insufficiently sanitized, to inject malicious SQL commands. This injection flaw allows remote attackers to execute arbitrary SQL queries on the backend database without requiring authentication or user interaction. The vulnerability can compromise the confidentiality, integrity, and availability of the system's data by enabling unauthorized data retrieval, modification, or deletion. The vulnerability has a CVSS 4.0 base score of 5.3, indicating medium severity. The exploit code is publicly available, increasing the risk of exploitation, although no active exploitation has been reported yet. The vulnerability does not require special privileges or user interaction, making it easier to exploit. The lack of a patch or vendor-provided fix at the time of publication necessitates immediate mitigation efforts by affected organizations. This vulnerability is typical of insecure coding practices where user input is not properly validated or parameterized in SQL queries, highlighting the need for secure development lifecycle practices.

The SQL injection vulnerability in the Online Product Reservation System can have significant impacts on organizations using this software. Successful exploitation can lead to unauthorized access to sensitive customer and transaction data, including reservation details and potentially payment information, undermining confidentiality. Attackers could alter or delete data, affecting data integrity and potentially disrupting business operations. The availability of the system could also be compromised if attackers execute destructive queries or cause database crashes. This can result in financial losses, reputational damage, and regulatory compliance issues, especially for organizations handling personal or payment data. Since the exploit is remotely executable without authentication, the attack surface is broad, increasing the likelihood of compromise. The public availability of exploit code further elevates the risk. Organizations relying on this product for e-commerce or reservation services may face operational disruptions and customer trust erosion if the vulnerability is exploited.

To mitigate CVE-2026-0591, organizations should first verify if they are running version 1.0 of the code-projects Online Product Reservation System. If so, immediate steps include: 1) Implement input validation and sanitization on the id and qty parameters to prevent malicious SQL code injection. 2) Employ parameterized queries or prepared statements in the /app/checkout/update.php script to eliminate direct concatenation of user inputs into SQL commands. 3) Restrict database user permissions to the minimum necessary to limit the impact of potential injection attacks. 4) Monitor web application logs for unusual or suspicious query patterns targeting the vulnerable parameters. 5) If a vendor patch becomes available, apply it promptly. 6) Consider deploying a web application firewall (WAF) with rules to detect and block SQL injection attempts targeting the affected endpoints. 7) Conduct a security code review and penetration testing focused on input handling in the application. 8) Educate developers on secure coding practices to prevent similar vulnerabilities in future releases. These targeted actions go beyond generic advice and address the root cause of the vulnerability.