Has anyone who is not in Slytherin been able to get in the Slytherin commone room. If so how did Ты do it?

Ты have to make the Polyjuice potion.

Ты used to have to brew the Polyjuice Potion first.
Now, all Ты have to do is go to the right moment and zoom in. Ты pass through the Стена and are in their common room.