The MetForm – Contact Form, Survey, Quiz, & Custom Form Builder for Elementor plugin for WordPress is vulnerable to Sensitive Information Exposure in versions up to, and including, 3.8.8 via the 'handle_file' function. This can allow unauthenticated attackers to extract sensitive data, such as Personally Identifiable Information, from files uploaded by users.
https://plugins.trac.wordpress.org/changeset/3099977/
https://plugins.trac.wordpress.org/browser/metform/trunk/core/entries/action.php#L1019