CVE-2026-4839 identifies a SQL injection vulnerability in SourceCodester Food Ordering System version 1.0, specifically in the /purchase.php file's Parameter Handler component. The vulnerability arises from improper sanitization or validation of the 'custom' parameter, which an attacker can manipulate to inject arbitrary SQL queries. This injection flaw allows remote attackers to execute unauthorized SQL commands against the backend database without requiring authentication or user interaction. The vulnerability's CVSS 4.0 base score is 6.9 (medium), reflecting its network attack vector, low attack complexity, and no privileges or user interaction needed. The impact on confidentiality, integrity, and availability is limited but present, as attackers may extract, modify, or delete data partially. No patches or fixes have been linked yet, and no known exploits are reported in the wild, but public disclosure increases the likelihood of future exploitation. The vulnerability affects only version 1.0 of the product, which is a niche food ordering system, limiting its broader impact but posing a significant risk to affected deployments.

The SQL injection vulnerability could allow attackers to access sensitive customer and order data stored in the backend database, potentially leading to data leakage or unauthorized data modification. This could compromise customer privacy and trust, disrupt order processing, and damage the reputation of organizations using the affected system. Attackers might also leverage the vulnerability to escalate privileges within the database or execute further attacks on the hosting infrastructure. Although the scope is limited to the affected version and product, organizations relying on this system for food ordering services could face operational disruptions and regulatory compliance issues if customer data is exposed or altered.

Organizations should immediately review their use of SourceCodester Food Ordering System version 1.0 and restrict or monitor access to the /purchase.php endpoint. Implementing input validation and parameterized queries or prepared statements for the 'custom' parameter is critical to prevent SQL injection. If source code access is available, developers should sanitize and validate all user inputs rigorously. Network-level protections such as web application firewalls (WAFs) can be configured to detect and block SQL injection attempts targeting this parameter. Until an official patch is released, consider isolating the affected system from the internet or limiting access to trusted IP addresses. Regularly audit database logs for suspicious queries and monitor for unusual activity. Finally, plan for an upgrade or migration to a more secure and actively maintained food ordering platform.