I noticed this on my site and tried the same here, for unregistered users or guests.
I would think that you would get the You need to be logged in to that or some other message as a guest, instead of displaying the embed media form. I looked at my permissions guests are pretty locked down. Maybe I missed something, but at the same time it displays the form as guest here on this board as well. Seems not to do anything as guest of course do to permissions. I just find it odd that this form is exposed as guest.
Embed media
xenforo.com
I would think that you would get the You need to be logged in to that or some other message as a guest, instead of displaying the embed media form. I looked at my permissions guests are pretty locked down. Maybe I missed something, but at the same time it displays the form as guest here on this board as well. Seems not to do anything as guest of course do to permissions. I just find it odd that this form is exposed as guest.