Cross-Site Scripting in Simple Inventory System 1.0

Executive Summary

This is a Stored Cross-Site Scripting (XSS) vulnerability in Simple Inventory System 1.0. It allows attackers to inject malicious scripts via the last_name parameter in the /register.php file during user registration. The input is stored in the database and later rendered without proper encoding, enabling execution of arbitrary JavaScript when the data is viewed by others.

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Detection Guidance

To detect this vulnerability, inspect the Simple Inventory System's user registration endpoint for improper handling of the last_name parameter. Check if input is stored without validation and rendered unsafely in HTML responses. Review server logs for unusual input patterns or JavaScript injection attempts in stored user data.

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Impact Analysis

Exploitation could lead to session hijacking, cookie theft, account takeover, unauthorized actions, or phishing attacks. Attackers may steal sensitive data or manipulate user sessions if they view pages containing the injected script.

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Compliance Impact

This vulnerability could violate GDPR by exposing user data through session hijacking or unauthorized access. For HIPAA, it may compromise protected health information if such data is processed in the system. Both standards require protection against unauthorized data access and breaches.

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Mitigation Strategies

Immediately implement server-side input validation for the last_name parameter to reject malicious scripts. Apply output encoding when displaying stored user data to prevent XSS execution. Deploy a restrictive Content Security Policy (CSP) to limit script execution. Update to a patched version if available.

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