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Vanilla Forums open source software suffers from vulnerabilities that could let an attacker gain access to user accounts , carry out web - cache poisoning attacks , and in some instances , execute arbitrary code .
 ( discover vulnerability: suffers,  execute arbitrary code: capabilities, let an attacker gain access to user accounts: capabilities, carry out web - cache poisoning attacks: capabilities, vulnerabilities: vulnerability, Vanilla Forums open source software: 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: suffers,  execute arbitrary code: capabilities, let an attacker gain access to user accounts: capabilities, carry out web - cache poisoning attacks: capabilities, vulnerabilities: vulnerability, Vanilla Forums open source software: vulnerable system) 