4chan.org is currently down in a number of places, and reports have emerged online that indicate there has been a massive hack.
On the reddit 4chan sub, there have been reports that the hacker reoppened the /qa/ subchan and leaked the email addresses of all the admins. 4chan hacked. Hacker reopens /qa/ and leaks all admins emails : r/4chan
There have been further reports that the vulnerability that led to the hack was the board allowing pdf files to be hosted.