Cross-Site Scripting in Online Shopping System 1.0

Executive Summary

This is a Stored Cross-Site Scripting (XSS) vulnerability in the Online Shopping System PHP v1.0. The flaw exists in the newsletter subscription feature, specifically in the /offersmail.php file where the email parameter is not properly validated or sanitized. Attackers can inject malicious scripts via the email input, which are then stored in the database and executed when viewed by other users, such as administrators.

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Detection Guidance

To detect this vulnerability, inspect the /offersmail.php endpoint for improper handling of the email parameter. Check if user input is stored without validation and rendered unsafely in HTML pages. Look for direct inclusion of user-supplied data in administrative interfaces or pages.

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Impact Analysis

An attacker could exploit this to inject malicious JavaScript that executes when privileged users view the affected pages. This may lead to session hijacking, theft of cookies or sensitive data, unauthorized actions on behalf of users, or phishing attacks. Users with admin access could have their sessions compromised, allowing attackers to perform actions like modifying system settings or stealing user information.

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Compliance Impact

This vulnerability could lead to unauthorized access to user data, violating GDPR's data protection principles and HIPAA's security requirements for protected health information. If exploited, it may result in data breaches, unauthorized data access, or disclosure, potentially leading to legal penalties, fines, or reputational damage for organizations handling sensitive user data.

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Mitigation Strategies

Implement input validation for the email parameter using functions like filter_var. Apply output encoding with htmlspecialchars when rendering user input in HTML. Deploy a restrictive Content Security Policy (CSP) to limit script execution.

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