CVE-2025-6455 is a critical SQL Injection vulnerability identified in version 1.0 of the code-projects Online Hotel Reservation System, specifically within an unknown functionality of the /messageexec.php file. The vulnerability arises from improper sanitization or validation of the 'Name' argument, which allows an attacker to inject malicious SQL code remotely without requiring authentication or user interaction. Exploiting this flaw can enable an attacker to manipulate backend database queries, potentially leading to unauthorized data access, data modification, or even complete compromise of the database. The CVSS 4.0 vector indicates that the attack vector is network-based (AV:N), with low attack complexity (AC:L), no privileges required (PR:N), and no user interaction needed (UI:N). The impact on confidentiality, integrity, and availability is rated as low individually, but collectively the vulnerability can have a significant impact depending on the database contents and system usage. Although no public exploits are currently known in the wild, the exploit details have been disclosed publicly, increasing the risk of exploitation. The absence of patches or mitigation guidance from the vendor further elevates the threat level. Given the nature of the system—a hotel reservation platform—compromise could expose sensitive customer data, booking details, and potentially payment information, as well as disrupt business operations through data corruption or denial of service.

For European organizations operating or relying on the code-projects Online Hotel Reservation System version 1.0, this vulnerability poses a tangible risk to both data confidentiality and business continuity. Customer personal data, including names, contact details, and booking histories, could be exfiltrated or altered, violating GDPR requirements and leading to regulatory penalties. Integrity attacks could result in fraudulent bookings or cancellations, damaging customer trust and revenue streams. Availability impacts might disrupt reservation services, causing operational downtime and reputational harm. Given the hospitality sector's importance in Europe, especially in countries with high tourism volumes, such disruptions could have broader economic implications. Additionally, attackers could leverage this vulnerability as a foothold to pivot into internal networks, escalating the threat beyond the reservation system itself. The medium CVSS score (6.9) reflects a moderate overall risk, but the critical classification and public exploit disclosure suggest that organizations should prioritize remediation to prevent potential data breaches and service interruptions.

1. Immediate code review and sanitization: Developers should audit the /messageexec.php file, focusing on the 'Name' parameter, to implement proper input validation and parameterized queries or prepared statements to prevent SQL injection. 2. Web Application Firewall (WAF): Deploy or update WAF rules to detect and block SQL injection patterns targeting the vulnerable parameter until a patch is available. 3. Network segmentation: Isolate the reservation system backend databases from other critical infrastructure to limit lateral movement in case of compromise. 4. Monitoring and logging: Enhance logging of database queries and web requests to detect anomalous activities indicative of SQL injection attempts. 5. Vendor engagement: Engage with code-projects to request an official patch or security update and monitor for any forthcoming advisories. 6. Incident response readiness: Prepare for potential exploitation by ensuring backups are current and tested, and have a response plan for data breaches or service disruptions. 7. Access controls: Restrict database user privileges to the minimum necessary to limit the impact of any successful injection. 8. Regular vulnerability scanning: Include this system in routine scans to detect exploitation attempts or other vulnerabilities.