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We looked into past several Remote Code Execution ( RCE ) vulnerabilities reported in Apache Struts , and observed that in most of them , attackers have used Object Graph Navigation Language ( OGNL ) expressions .
 ( discover vulnerability: reported,  Apache Struts: vulnerable system, Remote Code Execution ( RCE ) vulnerabilities: vulnerability) 
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: reported,  Apache Struts: vulnerable system, Remote Code Execution ( RCE ) vulnerabilities: vulnerability) 