The MailMunch – Grow your Email List plugin for WordPress is vulnerable to Reflected Cross-Site Scripting due to the use of add_query_arg without appropriate escaping on the URL in all versions up to, and including, 3.1.8. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that execute if they can successfully trick a user into performing an action such as clicking on a link.

The Constant Contact Forms by MailMunch plugin for WordPress is vulnerable to Reflected Cross-Site Scripting due to the use of add_query_arg without appropriate escaping on the URL in all versions up to, and including, 2.1.2. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that execute if they can successfully trick a user into performing an action such as clicking on a link.

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in MailMunch MailMunch – Grow your Email List allows Stored XSS.This issue affects MailMunch – Grow your Email List: from n/a through 3.1.6.

Cross-Site Request Forgery (CSRF) vulnerability in MailMunch MailMunch – Grow your Email List plugin <= 3.1.2 versions.