CVE-2026-3730: Hotel Reservation System SQLi Vulnerability

CVE-2026-3730 Overview

A SQL injection vulnerability has been discovered in itsourcecode Free Hotel Reservation System version 1.0. The vulnerability exists in the file /hotel/admin/mod_amenities/index.php?view=edit, where improper sanitization of the amen_id and rmtype_id parameters allows attackers to inject malicious SQL commands. This flaw enables remote attackers to execute arbitrary SQL queries against the backend database, potentially leading to unauthorized data access, data manipulation, or complete database compromise.

Critical Impact

Remote attackers can exploit this SQL injection vulnerability to extract sensitive guest information, modify reservation data, or potentially gain administrative access to the hotel reservation system without authentication.

Affected Products

• itsourcecode Free Hotel Reservation System 1.0

Discovery Timeline

• 2026-03-08 - CVE CVE-2026-3730 published to NVD
• 2026-03-09 - Last updated in NVD database

Technical Details for CVE-2026-3730

Vulnerability Analysis

This SQL injection vulnerability (CWE-89) exists due to insufficient input validation in the administrative amenities module of the Free Hotel Reservation System. The vulnerable endpoint /hotel/admin/mod_amenities/index.php?view=edit accepts user-controlled input through the amen_id and rmtype_id GET parameters without proper sanitization or parameterized queries. This falls under the broader category of injection flaws (CWE-74).

When processing edit requests for amenities, the application directly concatenates user-supplied values into SQL queries. An attacker can craft malicious input containing SQL syntax that modifies the intended query logic, enabling extraction of database contents, modification of records, or execution of administrative database operations.

Root Cause

The root cause of this vulnerability is improper input validation and the use of dynamic SQL query construction without prepared statements or parameterized queries. The application fails to sanitize the amen_id and rmtype_id parameters before incorporating them into database queries, allowing SQL metacharacters to be interpreted as part of the query structure rather than as literal data values.

Attack Vector

The attack can be carried out remotely over the network without requiring authentication. An attacker needs only to craft a malicious HTTP request to the vulnerable endpoint with specially crafted parameter values. The exploit has been publicly disclosed, increasing the risk of exploitation in the wild.

The vulnerable file path is /hotel/admin/mod_amenities/index.php?view=edit, where manipulation of the amen_id or rmtype_id parameters with SQL injection payloads can alter query behavior. Successful exploitation could allow attackers to bypass authentication, extract sensitive data including guest personal information and payment details, or modify reservation records.

For technical details on the exploitation technique, refer to the GitHub security discussion and VulDB entry #349708.

Detection Methods for CVE-2026-3730

Indicators of Compromise

• Unusual SQL error messages in web server logs referencing /hotel/admin/mod_amenities/index.php
• HTTP requests containing SQL injection payloads in amen_id or rmtype_id parameters (e.g., single quotes, UNION SELECT statements, OR 1=1 patterns)
• Unexpected database queries or data exfiltration attempts from the reservation system database
• Multiple rapid requests to the vulnerable endpoint from external IP addresses

Detection Strategies

• Deploy Web Application Firewall (WAF) rules to detect and block SQL injection patterns targeting the amen_id and rmtype_id parameters
• Implement database activity monitoring to alert on unusual query patterns or unauthorized data access attempts
• Configure intrusion detection systems (IDS) to flag HTTP requests containing common SQL injection payloads
• Enable detailed logging for the /hotel/admin/mod_amenities/ directory and review for suspicious activity

Monitoring Recommendations

• Monitor web server access logs for requests to /hotel/admin/mod_amenities/index.php?view=edit with unusual parameter values
• Set up alerts for database errors that may indicate failed injection attempts
• Review authentication logs for successful logins following suspected injection attacks that may indicate credential theft

How to Mitigate CVE-2026-3730

Immediate Actions Required

• Restrict network access to the administrative interface (/hotel/admin/) to trusted IP addresses only
• Implement a Web Application Firewall with SQL injection protection rules
• Consider taking the vulnerable application offline until a patch is available
• Review database logs for evidence of prior exploitation and assess potential data exposure

Patch Information

No official patch has been released by the vendor at this time. Organizations using itsourcecode Free Hotel Reservation System 1.0 should implement the workarounds below and monitor the vendor website for security updates. Additional vulnerability details are available in the VulDB submission #767010.

Workarounds

• Implement input validation on the amen_id and rmtype_id parameters to accept only numeric values
• Modify the vulnerable PHP code to use prepared statements with parameterized queries instead of string concatenation
• Deploy a reverse proxy with SQL injection filtering capabilities in front of the application
• Restrict access to the admin panel to authenticated users from internal networks only

# Apache configuration to restrict admin access by IP
<Directory "/var/www/html/hotel/admin">
    Require ip 192.168.1.0/24
    Require ip 10.0.0.0/8
</Directory>