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The FDA confirmed that St.Jude Medical 's implantable cardiac devices have vulnerabilities that could allow a hacker to access a device .
 ( discover vulnerability: confirmed,  The FDA: discoverer, vulnerabilities: vulnerability, allow a hacker to access a device: capabilities, implantable cardiac devices: vulnerable system, St.Jude Medical: vulnerable system owner) 
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,  The FDA: discoverer, vulnerabilities: vulnerability, allow a hacker to access a device: capabilities, implantable cardiac devices: vulnerable system, St.Jude Medical: vulnerable system owner) 