CVE-2026-3806: Resort Reservation System SQLi Vulnerability

CVE-2026-3806 Overview

A SQL injection vulnerability has been identified in SourceCodester/janobe Resort Reservation System version 1.0. This issue affects processing of the file /room_rates.php, where manipulation of the q parameter enables SQL injection attacks. The vulnerability can be exploited remotely by authenticated attackers and proof-of-concept exploit code has been publicly disclosed.

Critical Impact

Remote attackers can exploit this SQL injection vulnerability to extract sensitive database information, modify data, or potentially compromise the underlying server through database exploitation techniques.

Affected Products

• Oretnom23 Resort Reservation System 1.0
• SourceCodester Resort Reservation System 1.0

Discovery Timeline

• 2026-03-09 - CVE-2026-3806 published to NVD
• 2026-03-09 - Last updated in NVD database

Technical Details for CVE-2026-3806

Vulnerability Analysis

This SQL injection vulnerability exists in the Resort Reservation System's /room_rates.php endpoint. The application fails to properly sanitize user-supplied input passed through the q parameter before incorporating it into SQL queries. This allows an authenticated attacker with network access to inject arbitrary SQL commands that are executed by the database backend.

The vulnerability is classified under CWE-89 (Improper Neutralization of Special Elements used in an SQL Command) and CWE-74 (Improper Neutralization of Special Elements in Output Used by a Downstream Component). Both classifications indicate fundamental input validation failures in the application's data handling routines.

Root Cause

The root cause of this vulnerability is the lack of proper input sanitization and parameterized queries in the /room_rates.php file. The q parameter value is directly concatenated into SQL query strings without escaping special characters or using prepared statements, enabling attackers to break out of the intended query context and inject malicious SQL syntax.

Attack Vector

The attack vector is network-based, requiring low privileges and no user interaction. An authenticated attacker can craft malicious HTTP requests to the /room_rates.php endpoint with specially crafted SQL injection payloads in the q parameter. The injected SQL code is then executed with the privileges of the database user configured for the web application.

The vulnerability is exploited by sending requests to the vulnerable endpoint with SQL metacharacters in the q parameter. By inserting SQL syntax such as single quotes, UNION statements, or boolean-based payloads, attackers can manipulate the query logic to extract data, bypass authentication mechanisms, or modify database contents. Technical details and exploit code are available in the GitHub SQL Injection Exploit repository.

Detection Methods for CVE-2026-3806

Indicators of Compromise

• HTTP requests to /room_rates.php containing SQL injection patterns such as single quotes, UNION SELECT statements, or comment sequences in the q parameter
• Database error messages appearing in HTTP responses indicating query syntax errors
• Unusual database queries or query timing anomalies associated with the web application
• Access logs showing repeated requests to /room_rates.php with encoded or obfuscated parameter values

Detection Strategies

• Deploy Web Application Firewall (WAF) rules to detect SQL injection patterns in HTTP requests targeting /room_rates.php
• Enable database query logging and monitor for anomalous queries originating from the web application
• Implement intrusion detection signatures for common SQL injection payloads targeting PHP applications
• Review HTTP access logs for suspicious patterns in the q parameter including URL-encoded special characters

Monitoring Recommendations

• Monitor /room_rates.php endpoint access patterns for unusual request volumes or parameter lengths
• Set up alerts for database errors that may indicate injection attempts
• Track failed and successful database authentication events that could indicate lateral movement post-exploitation
• Implement real-time log correlation between web server and database logs

How to Mitigate CVE-2026-3806

Immediate Actions Required

• Restrict access to the Resort Reservation System to trusted networks only until patched
• Implement input validation and WAF rules to block SQL injection attempts
• Review database user privileges and apply principle of least privilege
• Consider taking the application offline if it handles sensitive reservation or payment data

Patch Information

No official vendor patch has been released at this time. The Resort Reservation System is distributed through SourceCodester and users should monitor the vendor's repository for updates. In the absence of an official fix, organizations should implement compensating controls or consider migrating to a more secure reservation management solution.

Additional vulnerability information is available from VulDB #349772.

Workarounds

• Implement prepared statements with parameterized queries in the /room_rates.php file to prevent SQL injection
• Deploy a Web Application Firewall (WAF) configured to block SQL injection attack patterns
• Apply strict input validation on the q parameter, allowing only expected characters and formats
• Restrict database user permissions to read-only access where modification is not required

# Example WAF rule for ModSecurity to block SQL injection attempts
SecRule ARGS:q "@detectSQLi" \
    "id:100001,\
    phase:2,\
    deny,\
    status:403,\
    log,\
    msg:'SQL Injection attempt detected in room_rates.php'"