SQL Injection Vulnerability in Free Hotel Reservation System 1.0 (CVE-2026-5551)

itsourcecode Free Hotel Reservation System version 1.0 is vulnerable to SQL injection. The vulnerability, identified as CVE-2026-5551, resides in the /hotel/admin/login.php file within the Parameter Handler component. Publicly available exploits target the email parameter, allowing unauthenticated remote attackers to inject malicious SQL queries. This vulnerability can lead to unauthorized access to sensitive data, modification of the database, or even complete compromise of the affected system. Due to the public availability of exploits, defenders must implement immediate detection and prevention measures.

Attack Chain

1. An attacker identifies an instance of itsourcecode Free Hotel Reservation System 1.0.
2. The attacker crafts a malicious HTTP request targeting the /hotel/admin/login.php endpoint.
3. The crafted request includes a SQL injection payload within the email parameter.
4. The application fails to properly sanitize the email input.
5. The application executes the attacker-controlled SQL query against the database.
6. The attacker bypasses authentication by injecting SQL to return valid credentials.
7. The attacker gains unauthorized administrative access to the system.
8. The attacker extracts sensitive information from the database, such as user credentials or reservation details, or modifies data.

Impact

Successful exploitation of CVE-2026-5551 can lead to complete compromise of the vulnerable Free Hotel Reservation System 1.0 instance. This can result in the exposure of sensitive customer data, including personal information and financial details. Attackers could also modify reservation data, disrupt hotel operations, or use the compromised system as a launching point for further attacks within the network. Given the nature of the vulnerability, any hotel or organization using this software is at risk of data breaches and financial losses.

Recommendation

• Deploy the Sigma rule Detect SQL Injection in Free Hotel Reservation System Login to detect exploitation attempts against /hotel/admin/login.php in web server logs.
• Apply input validation and sanitization to the email parameter in /hotel/admin/login.php to prevent SQL injection, mitigating CVE-2026-5551.
• Monitor web server logs for suspicious activity and SQL-related keywords in HTTP POST requests to /hotel/admin/login.php.
• Implement regular security audits and penetration testing to identify and address potential vulnerabilities in web applications.