1378
Last year , researchers found thousands of Magento - based online shops that had been compromised and infected with malicious code that skimmed payment card details .
 ( data breach: had been compromised,  Magento - based online shops: victim, thousands: number of victim, Last year: time) 
Locate the role in the text that participated in the event based on the event type and return it in the event list. 
 Option: Event type: phishing, data breach, ransom, discover vulnerability, patch vulnerability, Arguments type: vulnerable system, capabilities, vulnerability, number of victim, issues addressed, compromised data, damage amount, common vulnerabilities and exposures, victim, patch number, number of data, tool, discoverer, time, purpose, place, payment method, releaser, vulnerable system version, attacker, supported platform, patch, price, vulnerable system owner, trusted entity, attack pattern. 
Text: {0} 
Answer:
 ( data breach: had been compromised,  Magento - based online shops: victim, thousands: number of victim, Last year: time) 