Php Email Form Validation - V3.1 Exploit

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From: legit-user@example.com\r\nReply-To: phisher@evil.com\r\n

<?php
// Define a function to validate and sanitize email input
function validate_email($email) 
    $email = filter_var($email, FILTER_SANITIZE_EMAIL);
    if (!filter_var($email, FILTER_VALIDATE_EMAIL)) 
        return false;

Update to a patched version: Ensure you're running a version of the script that has been patched for this vulnerability (e.g., version 3.2 or later).
Implement robust input validation: Validate and sanitize all user-supplied data, including email headers and bodies.
Use secure email sending libraries: Consider using reputable email sending libraries or services that provide built-in security features.

POST /contact/form.php HTTP/1.1
Host: vulnerable-site.com
Content-Type: application/x-www-form-urlencoded