Reposted from Tonic's email alert this evening.
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Hello,

A security breach has sadly happened to DayZ, we are sending out a mass email to notify users who currently do not know.

To stay informed please refer to:
http://dayzmod.com/forum/showthread.php?tid=9123

A short summary:
Our forum database has been comprised and users are urged to change their passwords.

This is a good time to inform users to do good password practices, if you are not tech-savvy with today's modern age there are various different articles on practicing safe passwords and so fourth, below will contain a link that users should read to keep secure passwords so when security breaches like this happens you are not effected on a personal way. If you are contacted by a person claiming to be with the DayZ Dev team and they ask you for any personal information do not respond to this person and block them from contacting you. DayZ Dev Team will not ask you for any personal information or passwords.

https://itservices.uchicago.edu/page/good-password-practices

Also along with this database security breach our us.armafiles.info mirror (US Mirror) was also comprised and the attacker tried to spread a malicious application to infect users, if you downloaded an application called 'dayz_auto_updater.exe' from early this morning US Eastern time 6-8am on the date 6/9/2012 you should scan your computer for viruses and check your Appdata folder for .exe's containing the file names:

D3D8THK.exe
VSCover.exe

An extensive report by ThreatExpert can explain how to locate these malicious applications:

http://www.threatexpert.com/report.aspx?md5=ead7a55075d5ce1a32353832bed88069

And lastly for server hosts who have provided DayZ with RDP details for their servers are to quickly react on this and to change the RDP's account password and scan your server for any of the malicious software above as your servers integrity is comprised. Please do not contact DayZ Dev Team with new RDP Details, DayZ is no longer requesting RDP details for servers after this breach and hosts will be required to maintain their servers on their own. If a server host is contacted by anyone claiming to be with the DayZ Dev Team and are asking for server RDP details do not reply to this person and block them from getting in touch with you. DayZ Dev Team will not ask you for RDP details.

We cannot express how deeply sorry we are that this happened and are correcting our mistakes where we have went wrong so such a breach never happens again.

With kind regards,
Tonic
DayZ Dev Team