A spokesman for Chipotle declined to provide further details on the investigation.
"We want to make our customers and investors aware we recently detected unauthorized activity on a network that supports payment processing for purchases made in our restaurants", Jack Hartung, Chipotle chief financial officer told analysts during an investor presentation, via Fortune.
"Our investigation is focused on card transactions in our restaurants that occurred from March 24, 2017 through April 18, 2017".
"As long as compromised credit card data continues to be a valuable commodity on the black market, any company collecting or processing valid credit card information will continue to be a high value target", he said.
"The company is now soliciting help from cybersecurity experts and law enforcement officials to investigate the breach and has taken precautions to secure the system, it said".
Chipotle immediately launched an investigation and believe it has stopped the unauthorized activity. "If anyone sees an unauthorised charge, they should immediately notify the bank that issued the card". Hartung did promise that the company will notify customers who may have been affected by the breach once it learns more about specific restaurants that may have been affected and the exact timeframe for each.