Is Antiforgery Validation really needed for Login page when external return URL is not allowed?

I fallen in a scenario that

User opens two tabs for login page and try to login on both

Instead of showing an error message to user (I can’t think of a good meaningful message to explain antiforgery validation to end user anyways), I wan… Continue reading Is Antiforgery Validation really needed for Login page when external return URL is not allowed?