The Assistio plugin for WordPress is vulnerable to unauthorized modification of data due to a missing capability check and missing nonce verification on the assistio_plugin_delete_assistio_settings() function in versions up to, and including, 1.1.2. This makes it possible for authenticated attackers, with Subscriber-level access and above, to delete the plugin's options including the critical 'assistiobot_oauth_settings' option, which disrupts the plugin's integration with the Assistio bot service.