CVE-2026-4966 identifies a SQL injection vulnerability in the itsourcecode Free Hotel Reservation System version 1.0, specifically in the /admin/mod_room/index.php file when the 'view=edit' function processes the 'ID' parameter. An attacker can remotely manipulate this parameter to inject malicious SQL code, potentially allowing unauthorized access or modification of the backend database. The vulnerability requires low privileges (PR:L) but does not require authentication (AT:N) or user interaction (UI:N), making it remotely exploitable over the network. The impact on confidentiality, integrity, and availability is limited (VC:L, VI:L, VA:L), indicating partial compromise rather than full system takeover. The vulnerability has a CVSS 4.0 score of 5.3, reflecting medium severity. No patches or fixes have been published yet, and no known exploits are actively observed in the wild, but exploit code is publicly available, increasing the risk of future attacks. The affected product is a free hotel reservation system, likely used by small to medium-sized hospitality businesses. The vulnerability stems from improper input sanitization or lack of parameterized queries in the affected PHP script, allowing SQL injection via the 'ID' parameter. This flaw could be leveraged to extract sensitive data, modify records, or disrupt service availability within the reservation system's database.

The SQL injection vulnerability in the Free Hotel Reservation System can lead to unauthorized access to sensitive customer and booking data, data manipulation, or denial of service conditions affecting the reservation system's availability. For organizations relying on this software, exploitation could result in data breaches exposing personally identifiable information (PII) of guests, financial data, or internal business information. This can damage reputation, lead to regulatory penalties, and disrupt business operations. Since the vulnerability is remotely exploitable without authentication, attackers can launch attacks from anywhere, increasing the threat surface. The partial impact on confidentiality, integrity, and availability means attackers might not gain full control but can still cause significant harm by altering bookings, stealing data, or corrupting records. The hospitality industry, which relies heavily on reservation systems for daily operations, could face operational disruptions and loss of customer trust. Additionally, attackers could use the compromised system as a foothold for further network intrusion if the system is connected to broader corporate infrastructure.

To mitigate CVE-2026-4966, organizations should immediately restrict access to the /admin/mod_room/index.php interface by implementing network-level controls such as IP whitelisting or VPN access to limit exposure. Developers should apply input validation and sanitize all user-supplied parameters, especially the 'ID' parameter, to prevent injection of malicious SQL code. Refactoring the code to use parameterized queries or prepared statements is critical to eliminate SQL injection risks. If patches or updates become available from itsourcecode, they should be applied promptly. In the absence of official patches, consider deploying Web Application Firewalls (WAFs) with custom rules to detect and block SQL injection attempts targeting this endpoint. Regularly audit and monitor logs for suspicious activity related to the vulnerable function. Conduct security assessments and penetration testing on the reservation system to identify and remediate other potential vulnerabilities. Finally, ensure backups of the database are maintained securely to enable recovery in case of data corruption or loss.