Millions Possibly Impacted by Data Breach at Fast-Food Chain Sonic

Fast-food runner Sonic's payment systems breached KrebsOnSecurity

The numbers seem to be connected to a breach at Sonic, a fast-food chain, Krebs said.

The fast-food chain's stock dropped to its lowest value in almost two months Wednesday after Krebs on Security reported that a breach in the company's payment systems may have led to a "fire sale" of millions of stolen credit and debit card accounts. Some of the cards from the batch were found to be recently used at Sonic locations, according to Krebs.

Sonic Drive-In did inform Krebs about the security breach and said that the company that processes its credit card transactions spotted "unusual security regarding credit cards being used at Sonic". Some of those cards had also been previously used at Sonic, the site said.

Sonic, which operates thousands of locations across 45 states, confirmed the breach to Krebs, telling him an investigation is in its early stages.

In a statement released to KrebsOnSecurity, Sonic says it is working with law enforcement and third-party forensic experts to determine the scope of the issue. "While law enforcement limits the information we can share, we will communicate additional information as we are able".

"The security of our guests' information is very important to SONIC". Cliff Hudson, the company's CEO, told Business Insider last week that the chain was attempting to invest in technology to better compete with both rival restaurant concepts and competitors such as Amazon.

Sonic has acknowledged a security breach affecting an unknown number of its stores' payment systems.

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