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In 2012 Facebook ’s App Center was vulnerable to CSRF and the security researcher who discovered the flaw was awarded $ 5000 as a bounty .
 ( discover vulnerability: was vulnerable,  Facebook: vulnerable system owner, CSRF: capabilities, 2012: time, App Center: vulnerable system) 
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:
 ( discover vulnerability: was vulnerable,  Facebook: vulnerable system owner, CSRF: capabilities, 2012: time, App Center: vulnerable system) 