CVE-2026-3736 identifies a SQL injection vulnerability in the Simple Flight Ticket Booking System version 1.0 developed by code-projects. The vulnerability resides in the SearchResultRoundtrip.php file, specifically in the handling of an argument named 'results'. An attacker can remotely manipulate this parameter to inject arbitrary SQL commands into the backend database query. This injection occurs because the input is not properly sanitized or parameterized, allowing direct insertion of malicious SQL code. The attack vector requires no authentication or user interaction, making it accessible to any remote attacker who can reach the affected web application. The vulnerability can lead to unauthorized data disclosure, modification, or deletion, impacting the confidentiality, integrity, and availability of the system's data. Although the exploit has been publicly disclosed, no active exploitation has been reported yet. The CVSS 4.0 base score of 6.9 reflects a medium severity level, considering the vulnerability's ease of exploitation and potential impact. The affected product is a niche flight booking system, which limits the scope but still poses a risk to organizations relying on this software for online ticketing. The lack of available patches means organizations must implement code-level mitigations or upgrade to a fixed version once available.

The SQL injection vulnerability in the Simple Flight Ticket Booking System could allow attackers to execute arbitrary SQL commands on the backend database. This can lead to unauthorized access to sensitive customer data such as personal information and booking details, unauthorized modification or deletion of records, and potential disruption of booking services. For organizations, this could result in data breaches, loss of customer trust, regulatory penalties, and operational downtime. Since the vulnerability requires no authentication and can be exploited remotely, it increases the attack surface significantly. However, the impact is somewhat limited by the niche use of the affected software. Nonetheless, any compromised flight booking system could have cascading effects on travel operations and customer service, especially if attackers manipulate booking data or disrupt availability.

Organizations using the affected Simple Flight Ticket Booking System version 1.0 should immediately review and sanitize all user inputs, especially the 'results' parameter in SearchResultRoundtrip.php. Implementing parameterized queries or prepared statements is critical to prevent SQL injection. If source code access is available, refactor the vulnerable code to use secure database access methods. In the absence of an official patch, consider deploying web application firewalls (WAFs) with SQL injection detection rules tailored to the vulnerable parameter. Conduct thorough security testing, including automated scanning and manual code review, to identify and remediate similar injection points. Monitor database logs for unusual queries or access patterns indicative of exploitation attempts. Finally, plan to upgrade to a patched or alternative booking system version once available from the vendor.