CVE-2026-8713: Avada (Fusion) Builder <= 3.15.3 - Unauthenticated Arbitrary File Deletion via Form Entry Value

The Avada (Fusion) Builder plugin for WordPress is vulnerable to arbitrary file deletion due to insufficient file path validation in the maybedeletefiles function in all versions up to, and including, 3.15.3. This makes it possible for unauthenticated attackers to delete arbitrary files on the server, which can easily lead to remote code execution when the right file is deleted (such as wp-config.php). The attack requires a published Avada form configured to save entries to the database; an unauthenticated attacker submits a path-traversal payload via the wpajaxnoprivfusionformsubmitajax handler while also controlling the fusionprivacyexpirationinterval and privacyexpirationaction fields to force an immediate 'delete' cleanup, causing the planted entry to be automatically processed by the FusionFormDBPrivacy shutdown-hook routine without any administrator interaction.