The Favicon Generator plugin for WordPress is vulnerable to Cross-Site Request Forgery in versions up to, and including, 1.5. This is due to missing or incorrect nonce validation on the output_sub_admin_page_0 function. This makes it possible for unauthenticated attackers to delete arbitrary files on the server via a forged request granted they can trick a site administrator into performing an action such as clicking on a link. The plugin author deleted the functionality of the plugin to patch this issue and close the plugin, we recommend seeking an alternative to this plugin.
The web application does not, or cannot, sufficiently verify whether a request was intentionally provided by the user who sent the request, which could have originated from an unauthorized actor.