CVE-2025-11055 is a SQL Injection vulnerability identified in version 1.0 of the SourceCodester Online Hotel Reservation System. The flaw exists in the /admin/updateaddress.php file, specifically in the handling of the 'address' parameter. Improper sanitization or validation of this input allows an attacker to inject malicious SQL code remotely without requiring authentication or user interaction. This vulnerability enables an attacker to manipulate the backend database queries, potentially leading to unauthorized data access, data modification, or deletion. 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, and limited impact on confidentiality, integrity, and availability. Although no public exploits are currently known in the wild, the exploit code is publicly available, increasing the risk of exploitation. The vulnerability affects only version 1.0 of the product, which is a niche online hotel reservation system, typically used by small to medium hospitality businesses for managing bookings and customer information.

For European organizations, particularly those in the hospitality sector using the SourceCodester Online Hotel Reservation System version 1.0, this vulnerability poses a significant risk to the confidentiality and integrity of customer data, including personal and booking information. Exploitation could lead to unauthorized disclosure of sensitive customer details, manipulation of reservation data, or disruption of booking services. This could result in reputational damage, regulatory penalties under GDPR for data breaches, and financial losses. Given the remote and unauthenticated nature of the attack, even smaller hotels with limited cybersecurity resources are at risk. The impact is more pronounced for organizations that have not applied any custom mitigations or patches, as no official patch links are currently provided. Additionally, the availability of public exploit code lowers the barrier for attackers, increasing the likelihood of targeted attacks against vulnerable European hospitality businesses.

Since no official patches are currently available, European organizations using this system should immediately implement input validation and sanitization controls on the 'address' parameter within /admin/updateaddress.php. Employing parameterized queries or prepared statements in the database access code is critical to prevent SQL injection. Restricting access to the admin interface via network segmentation or VPNs can reduce exposure. Monitoring and logging database queries for anomalous patterns may help detect exploitation attempts early. Organizations should also consider upgrading to a newer, secure version of the software once available or migrating to alternative reservation systems with robust security. Regular backups of the database are essential to recover from potential data tampering. Finally, raising awareness among IT staff about this vulnerability and the risks of SQL injection will support proactive defense measures.