The Correct Prices plugin for WordPress is subject to Reflected Cross-Site Scripting, a flaw where an application includes untrusted data in a web page without proper validation, allowing an attacker to execute scripts in the victim's browser. The issue occurs within the `correct prices page()` function, which echoes the `$ SERVER['PHP SELF']` variable into a form's action attribute without input sanitization or output escaping. Since `$ SERVER['PHP SELF']` reflects path-info appended to the script URL, unauthenticated attackers can inject arbitrary markup and web scripts by tricking a user into clicking a specially crafted link.