Stored XSS in Gift Vouchers WordPress Plugin

Executive Summary

This vulnerability is a Stored Cross-site Scripting (XSS) issue in the WordPress Gift Vouchers Plugin versions 4.7.0 and below. It occurs due to improper neutralization of input during web page generation, allowing attackers to inject malicious scripts into the website.

Exploitation requires user interaction, such as clicking a malicious link or visiting a crafted page, which then enables attackers to execute scripts like redirects or advertisements on the affected site.

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Detection Guidance

This vulnerability is a Stored Cross-Site Scripting (XSS) in the WordPress Gift Vouchers Plugin versions 4.7.0 and below. Detection typically involves checking the plugin version and monitoring for suspicious script injections or unusual behavior on affected web pages.

You can detect the vulnerability by verifying the installed plugin version using WordPress CLI commands or by inspecting the plugin files.

• Check the plugin version via WP-CLI: wp plugin list | grep gift-voucher
• Search for suspicious script tags or payloads in the database entries related to gift vouchers, for example using SQL queries on the WordPress database.
• Monitor HTTP requests and responses for injected scripts or unexpected redirects that may indicate exploitation.

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Impact Analysis

If exploited, this vulnerability can allow attackers to inject malicious scripts into your website, potentially leading to unauthorized actions such as redirecting users to malicious sites or displaying unwanted advertisements.

Because the vulnerability is unauthenticated and has a moderate severity score (CVSS 7.1), it poses a significant risk, especially in mass exploitation campaigns targeting many websites.

Successful exploitation requires user interaction, but the impact can include compromised user trust, data theft, or further attacks leveraging the injected scripts.

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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, which could lead to unauthorized access to user data or session hijacking. Under GDPR, organizations must protect personal data from unauthorized access or disclosure. Failure to mitigate this vulnerability could result in violations of GDPR's data protection principles, particularly Article 5 (principles relating to processing of personal data) and Article 32 (security of processing).
• HIPAA: For organizations handling protected health information (PHI), this vulnerability could expose sensitive data to attackers. HIPAA requires covered entities to implement safeguards to protect PHI from unauthorized access. A successful XSS attack could lead to unauthorized disclosure of PHI, violating the HIPAA Security Rule (45 CFR Part 164, Subpart C).

Additionally, the CVSS score of 7.1 indicates a moderate risk, but the potential for exploitation in mass campaigns could amplify the compliance risks if the vulnerability is not addressed promptly.

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Mitigation Strategies

The immediate recommended step is to update the WordPress Gift Vouchers Plugin to version 4.7.1 or later, where the vulnerability is patched.

Until the update can be applied, apply the mitigation rule provided by Patchstack to block attacks targeting this vulnerability.

• Update the plugin to version 4.7.1 or newer.
• Implement the Patchstack mitigation rule to block malicious payloads.
• Educate users to avoid clicking suspicious links or visiting untrusted pages that could trigger the XSS.

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