CVE-2021-24556 Email Subscriber <= 1.1 - Unauthenticated Stored Cross-Site Scripting (XSS)

The kentoemailsubscriberajax AJAX action of the Email Subscriber WordPress plugin through 1.1, does not properly sanitise, validate and escape the submitted subscribeemail and subscribename POST parameters, inserting them in the DB and then outputting them back in the Subscriber list...