A few days ago information was released regarding a malware hack on a large number of Chipotle locations all over the nation. Not all, but most stores were hit with a malware that read and recorded customer credit card data as it went through the POS system. They are working with security firms and law enforcement to get to the bottom of it. They have however offered a page where you can check to see if a store or stores you went to during that time has been breached or not. Click here for more info: https://www.chipotle.com/security#security
The companies blog post indicates that during the investigation the malware was removed and there is no indication that other customer information was affected.