Input validation vulnerability in Import and export users and customers 1.27.5

The Import and Export Users and Customers plugin for WordPress has a security issue that may affect versions 1.27.5 and below. This is because it does not properly protect against harmful code being added to web pages. This could allow someone with high-level access to inject their own code onto pages, which would then run whenever a user visits the page. This only affects WordPress installations with multiple sites or where certain security features have been disabled.