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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
Please tell me event type and its trigger word from given type options. Output format is "type: trigger".  Option: phishing, data breach, ransom, discover vulnerability, patch vulnerability 
Text: {0} 
Answer:
 discover vulnerability: was vulnerable