The vulnerability exists in SourceCodester Sales and Inventory System 1.0 within the /update_supplier.php component that handles HTTP GET requests. Specifically, the 'sid' parameter is not properly sanitized, enabling an attacker to inject SQL commands remotely. This can lead to unauthorized database queries or modifications. The CVSS 4.0 vector indicates network attack vector, low attack complexity, no privileges or user interaction required, and low impact on confidentiality, integrity, and availability.

Successful exploitation could allow an attacker to execute arbitrary SQL commands on the backend database, potentially leading to unauthorized data access or modification. However, the impact is rated as low for confidentiality, integrity, and availability, reflecting limited potential damage or scope. No evidence of active exploitation is currently known.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, users should consider implementing input validation or web application firewall rules to block malicious SQL injection attempts targeting the 'sid' parameter in /update_supplier.php.