Executive brief
Simple Inventory System is an open-source PHP application used for inventory management. The user registration form contains a cross-site scripting (XSS) vulnerability in the last_name field that allows attackers to inject malicious scripts. An attacker can exploit this remotely by manipulating the registration form, potentially compromising user sessions and stealing sensitive data from other users viewing affected pages.
Technical details
The vulnerability is a stored XSS flaw in the /register.php file within the User Registration component. The last_name parameter is not properly sanitized or escaped before being stored and displayed, allowing an attacker to inject arbitrary JavaScript code. The attack is network-accessible and requires no authentication—an attacker can craft a malicious registration request with XSS payload in the last_name field. When other users view the affected page or user profile, the stored script executes in their browser context, enabling session hijacking, credential theft, or defacement. The vulnerability has been publicly disclosed and exploit code is available.
Affected products
- code-projects Simple Inventory System 1.0
Timeline
- 2026-08-31: disclosed
- other: Exploit code publicly available on GitHub