Sonic has acknowledged “unusual activity” on credit cards used at its restaurants, according to the company.
The Oklahoma City drive-through chain says it looks like hackers gained access to millions of credit and debit card numbers.
Up to five million cards may have been stolen.
Sonic says it is working with police and computer experts to find out what happened and the scope of the cyber-attack.
But experts say hackers likely gained remote access to the machines, where you swipe or insert your credit card.
The company did not disclose how many restaurants were impacted.
There are more than 3,500 Sonic restaurants in 44 states, including four in South Florida.
Read Sonic’s full statement:
Thank you for the opportunity to respond to your inquiry. Our credit card processor informed us last week of unusual activity regarding credit cards used at SONIC.
The security of our guests’ information is very important to SONIC. We are working to understand the nature and scope of this issue, as we know how important this is to our guests. We immediately engaged third-party forensic experts and law enforcement when we heard from our processor. While law enforcement limits the information we can share, we will communicate additional information as we are able.