Sony revealed today that nearly 100,000 PlayStation Network and Sony Online Entertainment user accounts have been compromised, as unknown attackers have tested "a massive set of sign-in IDs and passwords" against user accounts.In a post on the official PlayStation blog, Sony's SVP and chief information security officer Philip Reitinger explained that the company has detected breaches on its Sony Entertainment, PlayStation and Sony Online Entertainment Networks.Data from "one or more compromised lists from other companies, sites or other sources" outside of the Sony Networks was tested against hundreds of thousands of user accounts, and a total of 93,000 were compromised.These consist of 60,000 PSN and SEN accounts, and 33,000 SOE accounts. Sony has since temporarily turned these accounts off and contacted the owners of the accounts.Reitinger was quick to note that these compromised accounts make up only 0.1 percent of overall PSN, SEN and SOE accounts."Only a small fraction of these 93,000 accounts showed additional activity prior to being locked," he explained further. "We are currently reviewing those accounts for unauthorized access, and will provide more updates as we have them."He continued, "Please note, if you have a credit card associated with your account, your credit card number is not at risk. We will work with any users whom we confirm have had unauthorized purchases made to restore amounts in the PSN/SEN or SOE wallet."Earlier this year, Sony's PlayStation Network was hacked via an external intrusion, and the network was taken down for nearly a month