Attack Chain

1. The attacker identifies a vulnerable instance of SourceCodester Food Ordering System 1.0 exposed to the internet.
2. The attacker crafts a malicious HTTP request targeting the /purchase.php endpoint.
3. The attacker injects SQL code into the custom parameter of the HTTP request.
4. The web server receives the crafted HTTP request and passes the custom parameter value to the application's SQL query.
5. Due to the lack of proper sanitization, the injected SQL code is executed by the database server.
6. The attacker is able to read sensitive information such as user credentials or order details from the database.
7. The attacker may further modify or delete data within the database.
8. The attacker can potentially gain complete control of the database server and, potentially, the entire system, depending on database permissions.

Impact

Successful exploitation of CVE-2026-4839 can lead to a range of damaging consequences. Attackers could gain unauthorized access to sensitive customer data, including personal information, order history, and payment details. This data could be used for identity theft, financial fraud, or sold on the dark web. The vulnerability could also be exploited to modify or delete data, disrupting the application's functionality and potentially causing financial losses. The affected software is used for food ordering which impacts e-commerce.

Recommendation

• Apply available patches or upgrade to a secured version of SourceCodester Food Ordering System to remediate CVE-2026-4839.
• Implement input validation and sanitization on the /purchase.php file, specifically for the custom parameter, to prevent SQL injection attacks.
• Deploy the Sigma rule Detect SQL Injection in Food Ordering System to your SIEM to monitor for exploitation attempts.
• Monitor web server logs for suspicious activity targeting the /purchase.php endpoint, such as unusual characters or SQL keywords in the custom parameter, to detect potential attacks.