CVE-2026-3736: Simple Flight Ticket Booking SQLi Flaw

CVE-2026-3736 Overview

A SQL Injection vulnerability has been identified in code-projects Simple Flight Ticket Booking System version 1.0. This vulnerability affects the SearchResultRoundtrip.php file, where improper handling of the from parameter allows attackers to inject malicious SQL queries. The attack can be initiated remotely without authentication, potentially compromising the integrity and confidentiality of the underlying database.

Critical Impact
Remote attackers can exploit this SQL injection vulnerability to extract sensitive data, modify database contents, or potentially compromise the entire web application through malicious SQL queries injected via the from parameter.

Affected Products

Carmelo Simple Flight Ticket Booking System 1.0

Discovery Timeline

2026-03-08 - CVE-2026-3736 published to NVD
2026-03-09 - Last updated in NVD database

Technical Details for CVE-2026-3736

Vulnerability Analysis

This vulnerability represents a classic SQL Injection flaw (CWE-89) stemming from improper input neutralization (CWE-74). The SearchResultRoundtrip.php file fails to properly sanitize user-supplied input in the from parameter before incorporating it into SQL queries. This allows an attacker to manipulate the query structure by injecting arbitrary SQL commands.

The vulnerability is network-accessible, requiring no authentication or user interaction for exploitation. An attacker can remotely inject malicious SQL statements that will be executed by the database with the privileges of the application's database user. This could lead to unauthorized data access, data manipulation, or in severe cases, complete database compromise.

Root Cause

The root cause of this vulnerability is improper input validation and the lack of parameterized queries (prepared statements) in the SearchResultRoundtrip.php file. When user input from the from parameter is directly concatenated into SQL query strings without proper sanitization or escaping, the application becomes vulnerable to SQL injection attacks.

Attack Vector

The attack vector is network-based, allowing remote exploitation. An attacker can craft malicious HTTP requests containing SQL injection payloads in the from parameter of the SearchResultRoundtrip.php endpoint. Since no authentication is required, any remote attacker with network access to the application can attempt exploitation.

The vulnerability allows manipulation through standard SQL injection techniques such as UNION-based injection, boolean-based blind injection, or time-based blind injection. Successful exploitation could enable attackers to:

Extract sensitive user data including credentials and booking information
Modify or delete database records
Bypass authentication mechanisms
Potentially execute operating system commands depending on database configuration

For technical details on this vulnerability, see the GitHub CVE Issue Discussion and VulDB #349714.

Detection Methods for CVE-2026-3736

Indicators of Compromise

Unusual SQL error messages in web server logs originating from SearchResultRoundtrip.php
HTTP requests to SearchResultRoundtrip.php containing SQL keywords such as UNION, SELECT, OR 1=1, or encoded variants in the from parameter
Anomalous database query patterns indicating injection attempts or data exfiltration
Unexpected database read/write operations coinciding with requests to the affected endpoint

Detection Strategies

Implement Web Application Firewall (WAF) rules to detect and block SQL injection patterns in HTTP requests targeting SearchResultRoundtrip.php
Deploy intrusion detection system (IDS) signatures to identify common SQL injection payloads in network traffic
Enable detailed logging on web servers and database servers to capture suspicious query activity
Utilize SentinelOne's behavioral analysis capabilities to detect anomalous application behavior indicative of exploitation

Monitoring Recommendations

Monitor web server access logs for requests to SearchResultRoundtrip.php with unusually long or suspicious from parameter values
Set up alerts for database errors or exceptions that may indicate failed injection attempts
Implement real-time log analysis to correlate web requests with database query anomalies
Review database audit logs for unauthorized data access patterns

How to Mitigate CVE-2026-3736

Immediate Actions Required

Remove or restrict access to the Simple Flight Ticket Booking System until a patch is available
Implement input validation to sanitize the from parameter in SearchResultRoundtrip.php
Deploy WAF rules to block requests containing SQL injection patterns
Review database logs for evidence of prior exploitation and assess data integrity

Patch Information

As of the last modification date (2026-03-09), no official vendor patch has been released for this vulnerability. Organizations using Simple Flight Ticket Booking System 1.0 should monitor the Code Projects website for security updates or consider implementing the workarounds below.

For additional technical context, refer to VulDB CTI ID #349714.

Workarounds

Modify SearchResultRoundtrip.php to use parameterized queries (prepared statements) instead of string concatenation
Implement server-side input validation to restrict the from parameter to expected values only
Deploy a Web Application Firewall configured to block SQL injection attempts
Restrict network access to the application to trusted IP ranges only
Consider disabling the roundtrip search functionality until proper remediation is implemented

bash

# Example WAF rule for ModSecurity to block SQL injection in the from parameter
SecRule ARGS:from "@detectSQLi" \
    "id:1001,\
    phase:2,\
    block,\
    log,\
    msg:'SQL Injection Attempt Detected in from parameter',\
    logdata:'Matched Data: %{MATCHED_VAR}'"