586
When he disclosed the initial PHPMailer bug the researcher mentioned that he had developed an unauthenticated RCE exploit for “ a popular open - source application ( deployed on the Internet on more than a million servers ) as a PoC for real - world exploitation . ”
 ( discover vulnerability: disclosed,  he: discoverer, bug: vulnerability, PHPMailer: 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: disclosed,  he: discoverer, bug: vulnerability, PHPMailer: vulnerable system) 