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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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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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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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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