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Insecure backend databases and mobile apps are making for a dangerous combination , exposing an estimated 280 million records that include a treasure - trove of private user data .
 ( data breach: exposing,  mobile apps: victim, records: compromised data, 280 million: number of data, private user data: compromised data) 
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: exposing,  mobile apps: victim, records: compromised data, 280 million: number of data, private user data: compromised data) 