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Attacker stole site credentials and stole proprietary research Steven Peltzman , Forrester 's Chief Business Technology Officer , says the attacker stole valid Forrester.com user credentials that gave him access to Forrester.com accounts .
 ( data breach: stole,  site credentials: compromised data, Attacker: attacker) 
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:
 ( data breach: stole,  site credentials: compromised data, Attacker: attacker) 