Seen on Twitter:
Server compromised due to social engineering against ISP NFOrce. There will be extended downtime for forensic analysis and reinstall.
— BitcoinTalk (@bitcointalk) May 22, 2015
And over on redddit, theymos writes:
The forum’s ISP NFOrce managed to get tricked into giving an attacker access to the server. I think that the attacker had access for only about 12 minutes before I noticed it and had the server disconnected, so he probably wasn’t able to get a complete dump of the database. However, you should act as though your password hashes, PMs, emails, etc. were compromised. The forum will probably be down for 36-60 hours for analysis and reinstall. I’ll post status updates on Twitter @bitcointalk and I’ll post a complete report in a post in Meta once the forum comes back online.
Read more on REDDIT.
Thanks to @plaintech for this link.