The Kali Forms plugin for WordPress is vulnerable to Authenticated Options Change in versions up to, and including, 2.1.1. This is due to the update_option lacking proper authentication checks. This makes it possible for any authenticated attacker to change (or delete) the plugin's settings.
https://wordpress.org/plugins/kali-forms/#developers
https://blog.nintechnet.com/wordpress-kali-forms-plugin-fixed-multiple-vulnerabilities/