Detection Guidance

This vulnerability is a Stored Cross-Site Scripting (XSS) issue in the Complianz – GDPR/CCPA Cookie Consent WordPress plugin versions up to 7.4.4.2. Detection involves identifying if your WordPress installation uses this plugin version along with the Classic Editor plugin, and if there is any injected script in post content that could be exploited.

To detect the vulnerability on your system, you can check the installed plugin version and look for suspicious script injections in posts or pages edited by users with Contributor-level access or higher.

• Check the Complianz plugin version installed on your WordPress site. You can do this via WP-CLI with the command: wp plugin list | grep complianz
• Check if the Classic Editor plugin is installed and active: wp plugin list | grep classic-editor
• Search for suspicious script tags or encoded double-quote entities (&amp;#8221;) replaced by literal quotes in post content. For example, you can query the WordPress database posts table for suspicious content using SQL: SELECT ID, post_title FROM wp_posts WHERE post_content LIKE '%<script%' OR post_content LIKE '%&quot;%';
• Monitor HTTP traffic for reflected or stored XSS payloads by capturing requests and responses to pages that use the Complianz plugin's shortcodes or blocks.

Note that no specific detection commands or signatures are provided in the available resources, so detection relies on version checking and manual or automated inspection of post content for injected scripts.

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Impact Analysis

This Stored Cross-Site Scripting vulnerability can allow attackers with Contributor-level access to inject malicious scripts into website pages.

When other users visit these pages, the injected scripts can execute in their browsers, potentially leading to theft of sensitive information, session hijacking, or unauthorized actions performed on behalf of users.

Because the vulnerability requires authenticated access, it primarily impacts sites where users have Contributor or higher privileges.

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Mitigation Strategies

To mitigate the Stored Cross-Site Scripting vulnerability in the Complianz – GDPR/CCPA Cookie Consent plugin for WordPress, you should immediately update the plugin to version 7.4.5 or later, where the vulnerability has been fixed.

Ensure that the Classic Editor plugin is either removed or properly secured, as it is required to exploit this vulnerability.

Limit Contributor-level and higher access to trusted users only, since authenticated attackers with Contributor-level access can exploit this issue.

Review and sanitize any post content that may have been injected with malicious scripts due to this vulnerability.

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Executive Summary

The vulnerability in the Complianz – GDPR/CCPA Cookie Consent plugin for WordPress is a Stored Cross-Site Scripting (XSS) issue present in all versions up to and including 7.4.4.2.

It occurs because the function `revert_divs_to_summary` replaces certain HTML entities (`&amp;#8221;`) with literal double-quote characters (`&quot;`) in post content without properly sanitizing the input afterward.

This flaw allows authenticated attackers with Contributor-level access or higher to inject arbitrary web scripts into pages. These scripts execute whenever any user accesses the compromised page.

Exploitation requires the Classic Editor plugin to be installed and activated.

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Compliance Impact

The vulnerability in the Complianz – GDPR/CCPA Cookie Consent plugin allows authenticated attackers with Contributor-level access and above to inject arbitrary scripts via Stored Cross-Site Scripting (XSS). This can lead to unauthorized script execution on pages that users access.

Since the plugin is designed to help websites comply with privacy regulations such as GDPR and CCPA by managing cookie consent and related legal documents, the presence of this vulnerability undermines the integrity and security of the consent mechanism.

Exploitation of this vulnerability could result in unauthorized data access or manipulation, potentially violating data protection principles required by standards like GDPR and HIPAA, which mandate secure handling of personal data and protection against unauthorized access.

Therefore, until the vulnerability is patched (fixed in version 7.4.5), affected sites may be at increased risk of non-compliance due to security weaknesses in their consent management system.

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