Free WP Mail SMTP <= 1.0 is vulnerable to Cross Site Request Forgery (CSRF) to Stored XSS vulnerability

The Free WP Mail SMTP (Official – 2019) plugin for WordPress is vulnerable to Cross-Site Request Forgery in all versions up to, and including, 1.0. This is due to missing or incorrect nonce validation on a function. This makes it possible for unauthenticated attackers to perform an unauthorized action granted they can trick a site administrator into performing an action such as clicking on a link.