Hacker pleads guilty to accessing confidential Disney files Disney's private Slack channels were breached in the attack ... The hacker, Ryan Mitchell Kramer, who went by the name “NullBulge” was ...

You can't enter the Slack rooms, but you can see the names of the rooms. As Sam Biddle at Valleywag points out: Sure, you can't actually join the teams, or see what channels exist within them ...