When application developers have a return_to URL that does not match the OpenID realm parameter, the user will see the following warning message on the Yahoo! OpenID or OpenID+OAuth Hybrid authorization screen:

"Warning: Yahoo! cannot verify this website. We recommend you do not share any personal information with this website."

While this application may be safe, we present this message to users to inform them about a potentially unsecure application.

For more information on this warning, refer to the OpenID FAQ.