For those wondering about why Club Penguin Rewritten may be down, the game is under an illegal attack as confirmed by their official Twitter account. This means that you are unable to log-in until the attack is over.
Update: Codey has stated that Club Pingu is “most likely” the culprit
This is why Club Penguin Rewritten is down however the “Status” page is not working either, claiming that all servers are operational. There isn’t a virus, so don’t worry about that!
Update: CP Rewritten is in contact with their server provider
Update: Everything should hopefully be fine soon
However, I will try to keep you informed on the situation of this breaking news, but you don’t need to worry about your account or details like that!