The Oracle Microsystem, which you probably also used to pay for something through a debit or credit card, has been violated.
At present, it is not yet known how big the data is, but a source told the researcher Krebs journalist that 700 systems may have been affected. 
A hacker group known as the Carbanak Gang (referred to by Krebs as "a Russian organized cybercrime group") has been accused of stealing over $1 billion from banks and retailers over the past few years) is believed to be responsible for the breach.
Oracle acknowledged the hack, stating that it was “detected maliciouscode on certain Micros systems” and asked its customers to change the passwords associated with MICROS point-of-sale.
Investigators believe the breach started in a single system within Oracle's internal network, and spread through a Micros "gateway" used to help customers.
From there, hackers managed to steal user names and passwords from Micros users when they were logged on to the Web portal to check the answer bills or to manage their accounts.
It is not known how this particular hack can affect it. The most likely scenario is that hackers gained access to Micros, to put malicious software at the point-of-sale and steal credit card information.
Oracle is still investigating the violation but has not yet announced how deeply the hackers have reached.
