CVE-2026-4876: Hotel Reservation System SQLi Vulnerability

CVE-2026-4876 Overview

A SQL Injection vulnerability has been identified in itsourcecode Free Hotel Reservation System version 1.0. The vulnerability exists in an unknown function of the file /admin/mod_amenities/index.php?view=editpic, where improper handling of the ID argument allows attackers to inject malicious SQL statements. This flaw can be exploited remotely by authenticated attackers to manipulate database queries, potentially leading to unauthorized data access, modification, or deletion.

Critical Impact

Remote attackers can exploit this SQL Injection vulnerability to extract sensitive information from the database, modify or delete records, and potentially compromise the entire hotel reservation system's data integrity.

Affected Products

• itsourcecode Free Hotel Reservation System 1.0
• Administrative module (/admin/mod_amenities/index.php)
• Amenities picture editing functionality (view=editpic)

Discovery Timeline

• 2026-03-26 - CVE CVE-2026-4876 published to NVD
• 2026-03-26 - Last updated in NVD database

Technical Details for CVE-2026-4876

Vulnerability Analysis

This SQL Injection vulnerability (CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component) occurs in the administrative amenities module of the Free Hotel Reservation System. The vulnerable endpoint /admin/mod_amenities/index.php?view=editpic accepts an ID parameter that is directly incorporated into database queries without proper sanitization or parameterization.

The vulnerability allows authenticated attackers with access to the administrative panel to inject arbitrary SQL commands through the ID parameter. Since the input is not properly validated or escaped, malicious SQL statements can be appended to legitimate queries, allowing attackers to bypass intended query logic.

Root Cause

The root cause of this vulnerability is the lack of input validation and parameterized queries in the PHP code handling the ID parameter. The application directly concatenates user-supplied input into SQL statements, creating a classic SQL Injection attack surface. This implementation violates secure coding practices that mandate the use of prepared statements or parameterized queries for all database interactions involving user input.

Attack Vector

The attack can be performed remotely over the network by authenticated users with access to the administrative interface. An attacker would manipulate the ID parameter in the URL /admin/mod_amenities/index.php?view=editpic&ID=[payload] to inject SQL commands. The exploit is publicly available, increasing the risk of widespread exploitation. Successful exploitation could allow attackers to:

• Extract sensitive guest information including personal details and payment data
• Modify reservation records and pricing information
• Delete database entries causing service disruption
• Potentially escalate privileges within the application

The vulnerability requires low privileges (authenticated admin access) and no user interaction beyond the attacker crafting malicious requests. For detailed technical analysis, see the GitHub Issue Report documenting this vulnerability.

Detection Methods for CVE-2026-4876

Indicators of Compromise

• Unusual SQL syntax or special characters in web server access logs for /admin/mod_amenities/index.php
• Database query errors or exceptions appearing in application logs
• Unexpected data modifications in amenities-related database tables
• Authentication anomalies or privilege escalation attempts in admin panel

Detection Strategies

• Implement Web Application Firewall (WAF) rules to detect SQL Injection patterns in the ID parameter
• Deploy database activity monitoring to identify unusual query patterns or unauthorized data access
• Configure intrusion detection systems to alert on SQL Injection signatures targeting the affected endpoint
• Review web server logs for requests containing SQL metacharacters (', ", ;, --, /*) in URL parameters

Monitoring Recommendations

• Enable detailed logging for all requests to /admin/mod_amenities/ directory
• Monitor database query execution times for anomalies indicating data exfiltration
• Set up alerts for failed SQL query patterns that may indicate exploitation attempts
• Implement real-time monitoring of administrative user sessions for suspicious activity

How to Mitigate CVE-2026-4876

Immediate Actions Required

• Restrict access to the administrative panel to trusted IP addresses only
• Implement Web Application Firewall rules to block SQL Injection attempts
• Review and audit all administrative user accounts for unauthorized access
• Consider taking the amenities editing functionality offline until patched

Patch Information

At the time of publication, no official patch has been released by the vendor. Organizations using itsourcecode Free Hotel Reservation System 1.0 should monitor the IT Source Code website for security updates and consider implementing the workarounds below until an official fix is available. Additional vulnerability details are available at VulDB #353559.

Workarounds

• Implement input validation to restrict the ID parameter to numeric values only
• Modify the vulnerable code to use parameterized queries or prepared statements
• Deploy a WAF with SQL Injection protection rules in front of the application
• Restrict administrative panel access via IP whitelisting or VPN requirements
• Consider using an alternative hotel reservation system with better security practices

# Example: Apache .htaccess rules to restrict admin access
<Directory "/var/www/html/admin">
    # Restrict to specific IP addresses
    Require ip 192.168.1.0/24
    Require ip 10.0.0.0/8
    
    # Block common SQL injection patterns
    RewriteEngine On
    RewriteCond %{QUERY_STRING} (\'|\"|\;|\-\-|\/\*) [NC]
    RewriteRule .* - [F,L]
</Directory>