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A miscreant using the handle @cyberzeist claims to have infiltrated Plone CMS used by FBI.gov , using a zero day flaw allegedly for sale on an unnamed dark web site .
 ( discover vulnerability: claims,  A miscreant: discoverer, a zero day flaw: vulnerability, FBI.gov: vulnerable system, infiltrated Plone CMS: capabilities, @cyberzeist: 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: claims,  A miscreant: discoverer, a zero day flaw: vulnerability, FBI.gov: vulnerable system, infiltrated Plone CMS: capabilities, @cyberzeist: discoverer) 