Square Enix has confirmed reports that its official Deus Ex: Human Revolution and Eidos Montreal websites have been hacked.
A Square Enix spokesperson told Eurogamer this afternoon that 350 resumes from people interested in jobs at Eidos Montreal "may have been accessed", and up to 25,000 email addresses were obtained.
"Square Enix can confirm a group of hackers gained access to parts of our Eidosmontreal.com website as well as two of our product sites," Square Enix said.
"We immediately took the sites offline to assess how this had happened and what had been accessed, then took further measures to increase the security of these and all of our websites, before allowing the sites to go live again.
"Eidosmontreal.com does not hold any credit card information or code data, however there are resumes which are submitted to the website by people interested in jobs at the studio.
"Regrettably up to 350 of these resumes may have been accessed, and we are in the process of writing to each of the individuals who may have been affected to offer our sincere apologies for this situation.
"In addition, we have also discovered that up to 25,000 email addresses were obtained as a result of this breach. These email addresses are not linked to any additional personal information. They were site registration email addresses provided to us for users to receive product information updates.
"No dissemination or misappropriation of any other personal information has been identified at this point.
"We take the security of our websites extremely seriously and employ strict measures, which we test regularly, to guard against this sort of incident."
For a brief period on Wednesday the sites in question displayed a defacement banner that read "Owned by Chippy1337" along with several names and hacker handles of those supposedly responsible for the break-in.
According to logs lifted from the chatroom used by those responsible, the hackers are discussing whether to leak the "src".
Some were concerned that this related to the source code of Deus Ex: Human Revolution itself, but Eurogamer was told by one of the people embroiled in the hack that this is not the case.
Nor is the Deus Ex hack the work of a splinter cell of Anonymous, the group blamed by Sony for last month's devastating PlayStation Network compromise. It is allegedly the work of Gnosis, the group responsible for the hack of Gawker late last year.