CVE-2026-3790 identifies a SQL injection vulnerability in SourceCodester Sales and Inventory System version 1.0. The vulnerability resides in the file check_supplier_details.php within the POST parameter handler, specifically the stock_name1 parameter. An attacker can remotely manipulate this parameter to inject malicious SQL code due to insufficient input sanitization or improper query construction. This flaw allows attackers to execute arbitrary SQL commands on the backend database, potentially leading to unauthorized data disclosure, modification, or deletion. The vulnerability requires no authentication or user interaction, making it easier to exploit remotely over the network. The CVSS 4.0 base score is 5.3 (medium severity), reflecting the moderate impact on confidentiality, integrity, and availability, and the low attack complexity. Although no known exploits are currently active in the wild, the public availability of exploit code increases the likelihood of exploitation attempts. The vulnerability affects only version 1.0 of the product, which is a sales and inventory management system typically used by small to medium-sized enterprises. No official patches or updates have been linked yet, so mitigation relies on secure coding practices and access restrictions.

The potential impact of CVE-2026-3790 includes unauthorized access to sensitive business data such as supplier details, inventory records, and sales information. Attackers could manipulate or exfiltrate data, leading to financial loss, reputational damage, and operational disruption. Data integrity could be compromised by unauthorized modifications, potentially affecting inventory accuracy and business decisions. Availability impact is limited but possible if attackers execute destructive SQL commands. Since the vulnerability requires no authentication, it poses a significant risk to exposed systems accessible over the network. Organizations relying on this software for critical inventory and sales operations could face business continuity risks. The medium severity score reflects a moderate but tangible threat, especially for organizations lacking compensating controls or network segmentation. The exploitability without user interaction increases the urgency for remediation. However, the limited market penetration of this specific product constrains the global scale of impact.

To mitigate CVE-2026-3790, organizations should first check for any official patches or updates from SourceCodester and apply them promptly once available. In the absence of patches, immediate steps include implementing strict input validation and sanitization on the stock_name1 parameter to prevent injection of malicious SQL code. Refactoring the vulnerable code to use parameterized queries or prepared statements is critical to eliminate SQL injection risks. Network-level controls such as restricting access to the check_supplier_details.php endpoint via firewalls or VPNs can reduce exposure. Monitoring web application logs for suspicious POST requests targeting stock_name1 can help detect exploitation attempts. Employing web application firewalls (WAFs) with SQL injection detection rules can provide an additional protective layer. Regular security assessments and code reviews should be conducted to identify and fix similar vulnerabilities. Finally, organizations should consider isolating or migrating from vulnerable versions of the software to more secure alternatives if patching is not feasible.