CVE-2026-0583 identifies a SQL injection vulnerability in the Online Product Reservation System 1.0 developed by code-projects. The vulnerability resides in the user login module, specifically in the app/user/login.php file, where the 'emailadd' parameter is not properly sanitized or parameterized before being used in SQL queries. This allows an unauthenticated remote attacker to inject arbitrary SQL commands, potentially leading to unauthorized data retrieval, modification, or deletion within the backend database. The vulnerability does not require any user interaction or privileges, making it highly accessible for attackers. The CVSS 4.0 score of 6.9 (medium severity) reflects the network attack vector, low complexity, no authentication required, and partial impact on confidentiality, integrity, and availability. Although no known exploits are currently active in the wild, the public release of exploit code increases the likelihood of exploitation attempts. The vulnerability affects only version 1.0 of the product, and no official patches have been published yet. The lack of secure coding practices in handling user input in the login process is the root cause. Attackers exploiting this flaw could bypass authentication, access sensitive user data, or disrupt reservation services, which could have significant operational and reputational consequences for affected organizations.

For European organizations using the code-projects Online Product Reservation System 1.0, this vulnerability poses a significant risk to customer data confidentiality and system integrity. Exploitation could lead to unauthorized access to user accounts, exposure of personally identifiable information (PII), and manipulation or deletion of reservation data, potentially disrupting business operations. This is particularly critical for e-commerce and retail sectors relying on online reservation systems. The attack can be launched remotely without authentication, increasing the attack surface and risk of widespread exploitation. Data breaches resulting from this vulnerability could lead to regulatory penalties under GDPR, especially if sensitive customer data is compromised. Additionally, service availability could be impacted if attackers execute destructive SQL commands, causing downtime and loss of customer trust. The medium severity rating suggests that while the vulnerability is serious, it may not lead to full system compromise without additional factors. However, the public availability of exploit code elevates the urgency for mitigation to prevent exploitation in European markets.

To mitigate CVE-2026-0583, organizations should immediately audit and update the affected code to implement parameterized queries or prepared statements for all database interactions involving user input, particularly the 'emailadd' parameter in app/user/login.php. Input validation should be enforced to reject malformed or unexpected input formats. If source code modification is not immediately possible, deploying a Web Application Firewall (WAF) with rules to detect and block SQL injection patterns targeting the login endpoint can provide temporary protection. Monitoring logs for unusual database query patterns or repeated failed login attempts can help detect exploitation attempts early. Organizations should also restrict access to the reservation system to trusted networks where feasible and ensure that database accounts used by the application have the least privileges necessary. Regular backups of the database should be maintained to enable recovery in case of data corruption or deletion. Finally, organizations should stay alert for official patches or updates from the vendor and apply them promptly once available.