CVE-2026-3756 identifies a SQL injection vulnerability in SourceCodester Sales and Inventory System version 1.0, specifically in the /check_item_details.php script. The vulnerability arises from improper validation and sanitization of the 'stock_name1' parameter, which is directly incorporated into SQL queries. This allows an attacker to craft malicious input that alters the intended SQL command, potentially extracting sensitive data, modifying database contents, or disrupting normal operations. The vulnerability can be exploited remotely without authentication or user interaction, making it accessible to a wide range of attackers. The CVSS 4.0 vector indicates network attack vector (AV:N), low attack complexity (AC:L), no privileges required (PR:L), no user interaction (UI:N), and low impact on confidentiality, integrity, and availability (VC:L, VI:L, VA:L). Although no active exploitation has been reported, the availability of a public exploit increases the likelihood of future attacks. The vulnerability affects only version 1.0 of the product, which is an inventory and sales management system commonly used by small to medium businesses for tracking stock and sales data. The lack of official patches or updates at the time of publication necessitates immediate mitigation efforts by users.

The SQL injection vulnerability allows attackers to execute arbitrary SQL commands on the backend database, potentially leading to unauthorized disclosure of sensitive business data such as inventory levels, sales records, and customer information. Data integrity can be compromised by unauthorized modifications or deletions, which could disrupt business operations and financial reporting. Availability may also be affected if attackers execute commands that cause database errors or crashes. Since the vulnerability requires no authentication and can be exploited remotely, it poses a significant risk to organizations using the affected system, especially those lacking network segmentation or intrusion detection. The moderate CVSS score reflects that while the impact is not catastrophic, the ease of exploitation and potential for data compromise make it a serious concern. Organizations relying on this system for critical inventory management could face operational disruptions and reputational damage if exploited.

1. Immediate mitigation should focus on input validation and sanitization: implement strict server-side validation of the 'stock_name1' parameter to ensure it contains only expected characters and formats. 2. Use parameterized queries or prepared statements in the /check_item_details.php script to prevent direct injection of user input into SQL commands. 3. If possible, upgrade to a patched version of the software once available or apply vendor-provided fixes. 4. Employ web application firewalls (WAFs) with custom rules to detect and block SQL injection attempts targeting this parameter. 5. Restrict database user permissions to the minimum necessary to limit the impact of any successful injection. 6. Monitor logs for suspicious query patterns or repeated access to /check_item_details.php with unusual parameter values. 7. Network segmentation can reduce exposure by limiting access to the vulnerable system from untrusted networks. 8. Conduct regular security assessments and penetration testing to identify and remediate similar injection flaws proactively.