CVE-2025-6447 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 an unspecified function within the /admin/index.php file, where the 'Username' parameter is improperly sanitized, allowing an attacker to inject malicious SQL code. This injection flaw can be exploited remotely without requiring authentication or user interaction, enabling an attacker to manipulate backend database queries. The impact of such an injection can range from unauthorized data disclosure, modification, or deletion to complete compromise of the underlying database and potentially the hosting server. The vulnerability has been publicly disclosed, increasing the risk of exploitation, although no known exploits have been reported in the wild yet. The CVSS 4.0 base score is 6.9 (medium severity), reflecting the network attack vector, low attack complexity, and no need for privileges or user interaction, but with limited impact on confidentiality, integrity, and availability. The vulnerability affects only version 1.0 of the product, which is a niche online hotel reservation system, typically deployed by small to medium hospitality businesses. The lack of available patches or mitigations from the vendor at this time increases the urgency for affected organizations to implement compensating controls.

For European organizations, especially those in the hospitality sector using the Simple Online Hotel Reservation System version 1.0, this vulnerability poses a significant risk. Exploitation could lead to unauthorized access to sensitive customer data, including personal identification and booking details, potentially violating GDPR regulations and resulting in legal and financial penalties. Data integrity could be compromised, leading to incorrect booking information or fraudulent transactions. Availability of the reservation system could also be disrupted, impacting business operations and customer trust. Given the remote exploitability without authentication, attackers could leverage this vulnerability to gain a foothold in the network, potentially pivoting to other internal systems. The public disclosure of the vulnerability increases the likelihood of opportunistic attacks, especially targeting smaller hotels or chains that may lack robust cybersecurity defenses. The medium CVSS score suggests moderate impact, but the critical classification and ease of exploitation warrant serious attention.

1. Immediate mitigation should include restricting access to the /admin/index.php interface via network-level controls such as IP whitelisting or VPN access to limit exposure. 2. Employ Web Application Firewalls (WAFs) with custom rules to detect and block SQL injection payloads targeting the 'Username' parameter. 3. Conduct thorough input validation and sanitization on all user-supplied inputs, especially the 'Username' parameter, using parameterized queries or prepared statements to prevent injection. 4. If possible, upgrade or replace the affected system with a version or alternative product that addresses this vulnerability. 5. Monitor logs for suspicious activities indicative of SQL injection attempts, such as unusual query patterns or errors. 6. Implement database-level restrictions, such as least privilege access for the web application user, to minimize the impact of a successful injection. 7. Educate IT staff and administrators about the vulnerability and the importance of timely patching and monitoring. 8. Develop an incident response plan specific to web application attacks to quickly contain and remediate any exploitation attempts.