As I was trying enter the URL with beginning with dot of kind • I tried to enter in my browser like •facebook.com n finally it get converted into form of xn--example--.com
Steps of reproduction
A very unusual vulnerability related to idns n punnycode cant understand about this behavior. Entering just a appended dot of kind ◦is converting every site into idn format.i too reported at ibb also. Its affecting all the sites on internet.