CVE-2025-6419 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/edit_room.php file, specifically through the manipulation of the 'room_type' parameter. An attacker can remotely exploit this flaw without requiring any authentication or user interaction, as the vulnerability is accessible over the network with low attack complexity. The injection flaw allows an attacker to craft malicious SQL queries that can be executed by the backend database, potentially leading to unauthorized data access, data modification, or deletion. Given that the vulnerability affects an administrative interface, successful exploitation could compromise the integrity and confidentiality of sensitive hotel reservation data, including customer information and booking details. Although the CVSS 4.0 base score is 6.9 (medium severity), the presence of remote, unauthenticated exploitation and the critical nature of SQL injection in an administrative context elevate the risk profile. The vulnerability has been publicly disclosed, but no known exploits are currently reported in the wild. The lack of available patches or mitigations from the vendor increases the urgency for organizations to implement defensive measures. The vulnerability does not require user interaction, and the scope is limited to the affected version 1.0 of the product. The attack vector is network-based, and the vulnerability impacts confidentiality, integrity, and availability to a limited extent, as indicated by the CVSS vector components (VC:L, VI:L, VA:L).

For European organizations using the Simple Online Hotel Reservation System version 1.0, this vulnerability poses a significant risk to the confidentiality and integrity of customer and booking data. Exploitation could lead to unauthorized access to sensitive personal information, potentially violating GDPR regulations and resulting in legal and financial penalties. Additionally, attackers could manipulate reservation data, causing operational disruptions and reputational damage. The administrative nature of the affected interface increases the likelihood of severe impact if exploited, as attackers could gain elevated privileges or disrupt hotel management functions. Given the hospitality sector's importance in Europe, especially in countries with high tourism volumes, the vulnerability could affect a broad range of businesses from small hotels to large chains. The public disclosure without available patches increases the window of exposure, making timely mitigation critical to prevent data breaches or service disruptions.

1. Immediate mitigation should include restricting access to the /admin/edit_room.php endpoint by implementing network-level controls such as IP whitelisting or VPN access to limit exposure to trusted administrators only. 2. Employ Web Application Firewalls (WAFs) with custom rules to detect and block SQL injection attempts targeting the 'room_type' parameter. 3. Conduct thorough input validation and sanitization on all user-supplied data, especially parameters used in SQL queries. Although the vendor has not released patches, organizations should consider applying manual code reviews and fixes to parameter handling in the affected file. 4. Monitor logs for unusual database query patterns or repeated failed attempts to access administrative functions. 5. If feasible, upgrade or migrate to a more secure and actively maintained reservation system to eliminate reliance on vulnerable software. 6. Implement database-level protections such as least privilege principles for the database user accounts used by the application, limiting the potential damage of SQL injection exploits. 7. Educate administrative users on the risks and encourage strong authentication mechanisms even if not required by the vulnerability, to reduce overall attack surface.