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" Anyone who views a specially crafted profile gets popped , " a white hat hacker who has found several bugs in Steam in the past , and asked to remain anonymous , told me in a Twitter DM .
 ( discover vulnerability: has found,  a white hat hacker: discoverer, several bugs: vulnerability, Steam: 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: has found,  a white hat hacker: discoverer, several bugs: vulnerability, Steam: vulnerable system) 