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## https://sploitus.com/exploit?id=WPEX-ID:25B51ADD-197C-4AFF-B1A8-B92FB11D8697
1. Add the registration shortcode to a page.
2. Add the tabbed login/register widget on the same page.
3. Visit the page logged out and add this to the end of the URL /?tabbed-login-name="><script>alert(1)</script>

This could also be replicated by posting to any page with the widget present, which would not need the registration shortcode to be present on the page.