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Security researcher Alexander Klink detailed on his blog how the FTP protocol injection flaw could be used to send emails using Java 's FTP URL handler .
 ( discover vulnerability: detailed,  be used to send emails using Java 's FTP URL handler: capabilities, the FTP protocol injection flaw: vulnerability, Security researcher Alexander Klink: 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: detailed,  be used to send emails using Java 's FTP URL handler: capabilities, the FTP protocol injection flaw: vulnerability, Security researcher Alexander Klink: discoverer) 