Stored XSS in Free Gifts for WooCommerce Plugin

Executive Summary

This vulnerability is a Stored Cross-site Scripting (XSS) issue in the Free Gifts for WooCommerce WordPress plugin, versions 13.1.0 and below. It occurs due to improper neutralization of input during web page generation, allowing attackers to inject malicious scripts into the website.

When exploited, these malicious scripts can execute in the browsers of visitors to the affected site, potentially causing redirects, displaying unwanted advertisements, or other harmful actions.

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Detection Guidance

This vulnerability is a Stored Cross-Site Scripting (XSS) issue in the Free Gifts for WooCommerce plugin versions 13.1.0 and below. Detection typically involves checking the plugin version installed on your WordPress site.

You can detect the vulnerable plugin version by running commands to check the installed WordPress plugins, for example:

• Using WP-CLI: wp plugin list | grep free-gifts-for-woocommerce
• Manually checking the plugin version in the WordPress admin dashboard under Plugins.

Additionally, monitoring for suspicious script injections or unexpected redirects in web traffic logs or using a web application firewall (WAF) with rules targeting this vulnerability can help detect exploitation attempts.

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Impact Analysis

The vulnerability can be exploited by attackers to inject malicious scripts that execute in users' browsers, leading to potential impacts such as unauthorized redirects, display of unwanted advertisements, or other malicious activities.

Exploitation requires a privileged user to perform an action like clicking a malicious link or submitting a form, which means attackers may leverage social engineering to trigger the attack.

Because the vulnerability has a CVSS score of 7.1, it is considered moderately dangerous and could be used in widespread attacks targeting many websites.

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Compliance Impact

This vulnerability, a Stored Cross-Site Scripting (XSS) issue, can impact compliance with standards and regulations like GDPR and HIPAA due to its potential to compromise data integrity and confidentiality.

• GDPR: The vulnerability allows attackers to inject malicious scripts that could steal sensitive user data, such as cookies or session tokens, leading to unauthorized access to personal data. This violates GDPR's requirements for data protection and could result in non-compliance penalties.
• HIPAA: If the affected WooCommerce plugin is used in a healthcare-related context (e.g., processing patient data), the vulnerability could expose protected health information (PHI) to unauthorized parties. This would violate HIPAA's security and privacy rules, which mandate safeguards for PHI.
• General security standards: The vulnerability undermines the principle of least privilege and secure input handling, which are core requirements in frameworks like ISO 27001 or NIST SP 800-53. Failure to address such vulnerabilities may lead to non-compliance with these standards.

Organizations using the affected plugin should prioritize patching to version 13.3.0 or applying mitigation measures to avoid regulatory risks.

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Mitigation Strategies

The immediate recommended step is to update the Free Gifts for WooCommerce plugin to version 13.3.0 or later, where this vulnerability is patched.

Until the update can be applied, it is advised to implement the mitigation rule provided by Patchstack to block attacks targeting this vulnerability.

Also, restrict privileged user actions that could trigger the exploit, such as clicking unknown links or submitting untrusted forms.

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