CVE-2026-3771: Resort Reservation System SQLi Vulnerability

CVE-2026-3771 Overview

A SQL injection vulnerability has been discovered in SourceCodester/janobe Resort Reservation System version 1.0. This vulnerability affects the /accomodation.php file, where manipulation of the q parameter allows attackers to inject malicious SQL queries. The vulnerability can be exploited remotely, and exploit details have been publicly disclosed.

Critical Impact

Remote attackers can exploit this SQL injection vulnerability to extract sensitive data, modify database contents, or potentially compromise the underlying database server through malicious SQL queries injected via the q parameter.

Affected Products

• oretnom23 Resort Reservation System 1.0
• SourceCodester Resort Reservation System 1.0

Discovery Timeline

• 2026-03-08 - CVE-2026-3771 published to NVD
• 2026-03-09 - Last updated in NVD database

Technical Details for CVE-2026-3771

Vulnerability Analysis

This 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). The flaw exists in the /accomodation.php file where user-supplied input through the q parameter is incorporated directly into SQL queries without proper sanitization or parameterization.

The vulnerability allows authenticated attackers to inject arbitrary SQL syntax through a network-accessible endpoint. Successful exploitation could lead to unauthorized data access, data modification, or data deletion. The attack complexity is low, requiring only low-level privileges and no user interaction, making it relatively straightforward to exploit.

Root Cause

The root cause of this vulnerability is improper input validation and the failure to use parameterized queries or prepared statements when handling user-supplied data. The q parameter in /accomodation.php is directly concatenated into SQL queries, allowing attackers to break out of the intended query structure and inject their own SQL commands. This is a classic example of insufficient input sanitization in web application development.

Attack Vector

The attack is performed remotely over the network. An attacker with low-level privileges can craft malicious HTTP requests containing SQL injection payloads in the q parameter of /accomodation.php. The injected SQL code is then executed by the database server with the privileges of the application's database connection.

The vulnerability exploitation pattern follows standard SQL injection techniques where special characters and SQL keywords are inserted to manipulate the query logic. Attackers may use techniques such as UNION-based injection, boolean-based blind injection, or time-based blind injection depending on the application's response behavior.

For detailed technical analysis and exploitation patterns, refer to the GitHub SQL Injection Analysis documentation.

Detection Methods for CVE-2026-3771

Indicators of Compromise

• HTTP requests to /accomodation.php containing SQL syntax characters in the q parameter (single quotes, double dashes, UNION keywords, etc.)
• Database error messages in application logs indicating malformed SQL queries
• Unusual database query patterns or execution times suggesting injection attempts
• Unexpected database access patterns from the web application user account

Detection Strategies

• Deploy Web Application Firewall (WAF) rules to detect and block SQL injection patterns in HTTP requests
• Implement database activity monitoring to detect anomalous query patterns or unauthorized data access
• Configure intrusion detection systems (IDS) to alert on SQL injection signature patterns targeting /accomodation.php
• Enable detailed application and database logging to capture potential exploitation attempts

Monitoring Recommendations

• Monitor HTTP access logs for requests to /accomodation.php with suspicious parameter values
• Set up alerts for database errors related to SQL syntax issues originating from the web application
• Track database query execution times and patterns for anomalies indicating blind SQL injection attempts
• Review authentication and authorization logs for signs of unauthorized access following potential data extraction

How to Mitigate CVE-2026-3771

Immediate Actions Required

• Restrict access to /accomodation.php using network-level controls or authentication requirements until a patch is applied
• Implement a Web Application Firewall (WAF) with SQL injection protection rules in front of the application
• Review and audit all database access from the Resort Reservation System for signs of compromise
• Consider taking the application offline if it processes sensitive customer data

Patch Information

As of the last update date, no official vendor patch has been identified in the available references. Users should monitor the VulDB Vulnerability Report for updates on available fixes. Given that this is a SourceCodester project, users may need to implement manual code fixes or migrate to an alternative solution.

Workarounds

• Implement prepared statements or parameterized queries in the /accomodation.php file to properly handle user input
• Add input validation to sanitize the q parameter, rejecting any input containing SQL special characters
• Deploy a WAF configured with SQL injection detection rules to filter malicious requests before they reach the application
• Restrict database user privileges to minimum required permissions, limiting potential damage from successful exploitation

# Example WAF rule for ModSecurity to block SQL injection attempts
SecRule ARGS:q "@detectSQLi" \
    "id:1001,\
    phase:2,\
    deny,\
    status:403,\
    log,\
    msg:'SQL Injection attempt detected in q parameter',\
    tag:'CVE-2026-3771'"