The War Z launched last December and made a name for itself by promising features that were not available in the game.
The War Z has been knocked offline following a hack of its player database and forum.
The zombie survival game's publisher, OP Productions, issued a security alert to the players affected via email and has taken the game itself and the forum offline whilst the hack is investigated.
The information swiped included email addresses and passwords used to log in to the game as well as email addresses and passwords used to access the forum. IP addresses of the forum's users and any information posted to the forums has also been accessed.
OP Productions does however assert that the hacked passwords were encrypted but also warns that these can be broken into through a brute force attempt and has advised players to change their passwords anyway.
The publisher also states that no financial information or payment histories have been exposed in the attack as all payments are made outside of OP Productions' system and go through a third party.
'We have already taken a number of steps to increase security and are continuing to work with external advisors and investigators to identify and implement measures to minimize the chance of this happening in the future,'
read a statement from OP Productions. 'This has been a humbling experience for us. While we all know that there is no guaranty of security on the internet, our goal is to try our very best to protect your data.'
Although nobody has claimed responsibility for the hack, The War Z has done more than enough to earn the ire of gamers. Launching in December last year in a rather unfinished state and featuring micro-transactions of questionable value, Valve even felt it necessary to offer refunds to anyone who bought the game through Steam and de-listed the title until some of its more severe bugs were dealt with.
The War Z has come under attack from hackers before with developer Hammerpoint claiming the game suffered from various DDOS attacks on its login server back in January this year.