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However , John Bambenek , threat systems manager , Fidelis Cybersecurity , revealed that the combination of these features has allowed the firm to uncover a big privacy problem .
 ( discover vulnerability: revealed,  Fidelis Cybersecurity: discoverer, threat systems manager: discoverer, John Bambenek: 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: revealed,  Fidelis Cybersecurity: discoverer, threat systems manager: discoverer, John Bambenek: discoverer) 