CVE-2025-6450 is a critical SQL Injection vulnerability identified in version 1.0 of the Simple Online Hotel Reservation System developed by code-projects. The vulnerability exists in the /admin/confirm_reserve.php file, specifically through improper sanitization of the 'transaction_id' parameter. An attacker can remotely exploit this flaw without requiring any authentication or user interaction, by manipulating the 'transaction_id' argument in HTTP requests. This allows the attacker to inject malicious SQL queries directly into the backend database. The consequence of successful exploitation includes unauthorized data access, modification, or deletion, potentially compromising the confidentiality, integrity, and availability of the reservation system's data. The CVSS 4.0 base score is 6.9 (medium severity), reflecting the network attack vector, low attack complexity, no privileges or user interaction required, but limited impact on confidentiality, integrity, and availability (each rated low). Although no known exploits are currently observed in the wild, the public disclosure of the vulnerability increases the risk of exploitation. The vulnerability affects only version 1.0 of the product, and no official patches or mitigations have been published yet. The Simple Online Hotel Reservation System is typically used by small to medium-sized hospitality businesses to manage bookings and transactions, making the database a valuable target for attackers seeking customer data or to disrupt operations.

For European organizations using the Simple Online Hotel Reservation System version 1.0, this vulnerability poses a significant risk. Successful exploitation could lead to unauthorized access to sensitive customer data, including personal and payment information, violating GDPR requirements and potentially resulting in heavy fines and reputational damage. Integrity of booking records could be compromised, leading to fraudulent reservations or cancellations, disrupting business operations and customer trust. Availability could also be affected if attackers execute destructive SQL commands, causing service outages. Given the hospitality sector's importance in Europe, especially in countries with large tourism industries, the impact could extend to financial losses and operational disruptions. Additionally, attackers could leverage this vulnerability as a foothold for further network intrusion or lateral movement within the organization's infrastructure.

Organizations should immediately audit their use of the Simple Online Hotel Reservation System to determine if version 1.0 is deployed. If so, they should consider the following specific mitigations: 1) Implement input validation and parameterized queries or prepared statements in the /admin/confirm_reserve.php script to sanitize the 'transaction_id' parameter and prevent injection. 2) Restrict access to the /admin/confirm_reserve.php endpoint by IP whitelisting or VPN access to limit exposure. 3) Monitor web server and database logs for suspicious queries or repeated access attempts to the vulnerable parameter. 4) Employ Web Application Firewalls (WAFs) with custom rules to detect and block SQL injection patterns targeting 'transaction_id'. 5) Isolate the reservation system database with strict least privilege access controls to minimize damage if exploited. 6) Plan for an upgrade or patch deployment once the vendor releases a fix, or consider migrating to a more secure reservation platform. 7) Conduct regular security assessments and penetration testing focused on injection vulnerabilities. These steps go beyond generic advice by focusing on the specific vulnerable parameter and access points, tailored to the affected system.