Impact Analysis

This vulnerability can allow an attacker with Contributor-level access or above to inject malicious scripts into your website's pages.

When other users visit the infected pages, these scripts will execute in their browsers, potentially leading to theft of user credentials, session hijacking, defacement, or other malicious activities.

Because the vulnerability is a Stored Cross-Site Scripting issue, the injected scripts persist on the site and affect all users who view the compromised content.

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Compliance Impact

I don't know

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Detection Guidance

This vulnerability involves Stored Cross-Site Scripting (XSS) via the `[labb_pricing_item]` shortcode's `title` and `value` attributes in the Livemesh Addons for Beaver Builder plugin for WordPress. Detection involves identifying if your WordPress installation uses this plugin version 3.9.2 or earlier and if any pages contain injected scripts via these shortcode attributes.

You can detect the vulnerability by searching for the presence of the vulnerable shortcode in your WordPress content and checking for suspicious script tags or encoded payloads in the `title` or `value` attributes.

• Use WP-CLI to search posts/pages for the shortcode: wp post list --post_type=page,post --field=ID | xargs -I % wp post get % --field=post_content | grep '\[labb_pricing_item'
• Search for suspicious script tags or encoded HTML entities in the database: mysql -u [user] -p -e "SELECT ID, post_content FROM wp_posts WHERE post_content LIKE '%\[labb_pricing_item%script%' OR post_content LIKE '%\[labb_pricing_item%<script%'"
• Monitor HTTP traffic for unusual script execution or injected payloads on pages using this shortcode.

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Mitigation Strategies

To mitigate this Stored Cross-Site Scripting vulnerability in the Livemesh Addons for Beaver Builder plugin, immediate steps include:

• Update the plugin to a version later than 3.9.2 where the vulnerability is fixed.
• If an update is not immediately available, restrict Contributor-level and above users from adding or editing content that uses the `[labb_pricing_item]` shortcode.
• Temporarily disable or remove the plugin if possible to prevent exploitation.
• Implement Web Application Firewall (WAF) rules to block malicious payloads targeting this shortcode.
• Review and sanitize existing content using the shortcode to remove any injected scripts.

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Executive Summary

The Livemesh Addons for Beaver Builder plugin for WordPress has a Stored Cross-Site Scripting (XSS) vulnerability in its `[labb_pricing_item]` shortcode's `title` and `value` attributes in all versions up to and including 3.9.2.

This vulnerability arises because the plugin uses `htmlspecialchars_decode()` after `wp_kses_post()`, which means that HTML entities are decoded back into executable code after sanitization, allowing malicious scripts to be injected.

Authenticated attackers with Contributor-level access or higher can exploit this flaw to inject arbitrary web scripts into pages, which will execute whenever a user accesses those pages.

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