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Grossman and Jake Davis , a former LulzSec hacker , confirmed that the bug existed as of Tuesday morning and analyzed the potential attacks that bad guys could do if they were to exploit it .
 ( discover vulnerability: confirmed that,  the bug: vulnerability, Grossman: discoverer, Tuesday morning: time, Jake Davis: discoverer, a former LulzSec hacker: discoverer) 
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: confirmed that,  the bug: vulnerability, Grossman: discoverer, Tuesday morning: time, Jake Davis: discoverer, a former LulzSec hacker: discoverer) 