Bohemia Interactive, the creator of Arma and the developer of the standalone retail version of DayZ, has had its website hacked the studio announced in a statement.
The website carries information such as usernames, passwords and email addresses which may have been compromised as part of the hack. Financial information, including credit card details, are not affected.
Bohemia notes "We have unfortunately discovered that an illegal attempt has been made to access certain of our online websites, leading to the download of a database containing usernames, email addresses and encrypted passwords. Please note due to the encryption of the passwords it is very unlikely that anything nefarious can be done with this information.
"We would like to reassure everyone that no other information such as credit card details are stored by us and thus was not at any risk from this illegal breach."
Bohemia has temporarily closed access to their forums as a result of the breach.
Earlier this month Ubisoft's UPlay service was also breached and the publisher recommended users change their passwords as a precaution.