CVE-2026-4612: Hotel Reservation System SQLi Vulnerability

CVE-2026-4612 Overview

A SQL Injection vulnerability has been identified in itsourcecode Free Hotel Reservation System version 1.0. The vulnerability exists in the Parameter Handler component, specifically within the file /hotel/admin/mod_users/index.php?view=edit&id=8. Manipulation of the account_id argument allows attackers to inject malicious SQL statements into database queries, potentially compromising the underlying database and sensitive user data.

Critical Impact

This SQL Injection vulnerability enables remote attackers to manipulate database queries without authentication, potentially leading to unauthorized data access, modification, or deletion of hotel reservation records and user credentials.

Affected Products

• itsourcecode Free Hotel Reservation System 1.0
• Parameter Handler component (/hotel/admin/mod_users/index.php)

Discovery Timeline

• 2026-03-23 - CVE-2026-4612 published to NVD
• 2026-03-24 - Last updated in NVD database

Technical Details for CVE-2026-4612

Vulnerability Analysis

This SQL Injection vulnerability (CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component) affects the user management module of the Free Hotel Reservation System. The vulnerability is remotely exploitable and requires no authentication, making it particularly dangerous for publicly accessible hotel booking systems.

The exploit has been publicly disclosed, which increases the risk of exploitation in the wild. Attackers can leverage this vulnerability to extract sensitive information from the database, including guest personal data, reservation details, and administrative credentials.

Root Cause

The root cause of this vulnerability is improper input validation and lack of parameterized queries in the account_id parameter handling. The application directly incorporates user-supplied input into SQL queries without proper sanitization or the use of prepared statements. This allows attackers to break out of the intended query structure and inject arbitrary SQL commands.

Attack Vector

The attack vector is network-based, requiring no user interaction or authentication. An attacker can craft malicious HTTP requests targeting the vulnerable endpoint at /hotel/admin/mod_users/index.php?view=edit&id=8 with a manipulated account_id parameter. By injecting SQL metacharacters and additional SQL commands, the attacker can modify the query logic to extract data, bypass authentication, or modify database contents.

The vulnerability can be exploited by appending SQL injection payloads to the account_id parameter, such as UNION-based injection techniques to extract data from other tables, or boolean-based blind injection to enumerate database contents character by character. For technical details on the exploitation methodology, refer to the GitHub Issue Report.

Detection Methods for CVE-2026-4612

Indicators of Compromise

• Unusual or malformed requests to /hotel/admin/mod_users/index.php containing SQL syntax in parameters
• Database error messages in web server logs indicating SQL syntax errors
• Anomalous database query patterns or unexpected data exfiltration attempts
• Multiple rapid requests to the vulnerable endpoint from a single source

Detection Strategies

• Deploy Web Application Firewall (WAF) rules to detect and block SQL injection patterns in the account_id parameter
• Implement database activity monitoring to identify unusual query patterns or unauthorized data access
• Configure intrusion detection systems (IDS) to alert on SQL injection signatures targeting the affected endpoint
• Review web server access logs for requests containing SQL metacharacters (single quotes, UNION, SELECT, etc.)

Monitoring Recommendations

• Enable detailed logging for the /hotel/admin/mod_users/ directory and associated database operations
• Set up alerts for database errors that may indicate injection attempts
• Monitor for unusual traffic patterns to administrative endpoints
• Implement real-time log analysis for early detection of exploitation attempts

How to Mitigate CVE-2026-4612

Immediate Actions Required

• Restrict network access to the administrative interface (/hotel/admin/) using firewall rules or IP whitelisting
• Implement Web Application Firewall rules to filter SQL injection attempts on the affected endpoint
• Consider taking the affected application offline until a proper fix is applied
• Review database logs for evidence of past exploitation attempts

Patch Information

No official vendor patch has been released for this vulnerability. Administrators should contact itsourcecode for updates regarding security fixes. Given the public disclosure of this exploit, immediate protective measures are essential while awaiting an official patch.

Additional information about this vulnerability can be found in the VulDB entry #352476 and the vulnerability submission details.

Workarounds

• Implement server-side input validation to sanitize the account_id parameter before processing
• Modify the application code to use prepared statements or parameterized queries for all database operations
• Deploy a reverse proxy or WAF with SQL injection filtering capabilities in front of the application
• Restrict access to administrative functions to trusted IP addresses only

# Example: Apache .htaccess configuration to restrict admin access
<Directory "/var/www/html/hotel/admin">
    Order Deny,Allow
    Deny from all
    Allow from 192.168.1.0/24
    Allow from 10.0.0.0/8
</Directory>