In a notice to all Playstation Network users Sony said that they found out there has been a possibility of unauthorized access to personal information on the PLAYSTATION Store through PCs, a content download service of the PLAYSTATION Network.
It is possible that the passwords of a small percentage of PLAYSTATION Network users may have been changed through unauthorized access, making it possible to view users’ personal information and/or use the Wallet for the store.
Since accounts do not display entire credit card numbers, any unauthorized access to a PLAYSTATION Network account is very unlikely to compromise the user’s credit card number. In any case, Sony has taken immediate measures to rectify this issue and system security is restored.
The company has investigated the extent of unauthorized access and possible alteration of passwords that could have occurred before corrective measures were taken, and are directly contacting customers who may have been affected by this incident.
In order to verify that your account is intact, sign in to the service. If you can successfully sign in with your pre-set password, your account is not affected by this incident.