Recently, the publisher detected 35,252 unauthorised logins to its Konami ID service from over four million attempts. The IDs and passwords appear to have been leaked from an external service provider, which has yet to be named. In an official statement, the Japanese company revealed the attack took place over an extended period of time between June 13, 2013, and July 7, 2013. And Konami has stated that names, addresses, dates of birth, telephone numbers and e-mail addresses may have been exposed during the attack.

Measures have already been taken to block the IDs and passwords used in the breach, and those users affected should have already been contacted by e-mail. But the publisher has urged all users of the Konami ID service to reset their passwords.