CVE-2026-84938: Avada (Fusion) Builder <= 3.16.1 - Unauthenticated Stored Cross-Site Scripting via Form Notification Dynamic-Data action_hook
The Avada (Fusion) Builder plugin for WordPress is vulnerable to Stored Cross-Site Scripting via Form Notification Dynamic-Data actionhook → Media Upload Chain (ID3 Metadata / htmlattributes) in all versions up to, and including, 3.16.1 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. Exploitation requires that a Fusion Form is embedded on an admin-authored page (granting manageoptions context to the Dynamic Data action hook callback), and that a Post Cards element configured to display attachment post types is present on a publicly accessible page so the planted shortcode payload is rendered.
Event History
Frequently Asked Questions
Does exploitation require an authenticated WordPress account?
No. The issue can be exploited by unauthenticated attackers, provided the required Fusion Form and publicly accessible Post Cards configuration are present.
What site configuration makes the vulnerability practically exploitable?
A Fusion Form must be embedded on an admin-authored page, which grants manage_options context to the Dynamic Data action hook callback. A publicly accessible page must also contain a Post Cards element configured to display attachment post types so that the planted shortcode payload is rendered.
What happens after a successful injection?
Arbitrary web scripts are stored in affected content and execute when a user visits an injected page. The vulnerability is rated high and impacts confidentiality and integrity.