A traffic sign with the Oracle logo sits outside Oracle headquarters on Dec. 16, 2014, in Redwood City, California.
Oracle detected malicious code in certain payment systems used in hospitality and retail, the company said.
Details were first reported by cybersecurity writer Brian Krebs on Monday.
All customers of Micros, known for cloud-based tablet and mobile payments for food, beverages and hotels, are being asked to reset their passwords for an online support portal after Oracle found the malicious code in legacy systems, Krebs wrote on his website, KrebsOnSecurity. Oracle’s other cloud and corporate offerings were…