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Several users and security researchers noticed this week that it was possible to put malicious javascript code inside a Steam user 's profile page , and the code will execute whenever someone visits that profile page , without any need for the victim to click anywhere .
 ( discover vulnerability: noticed,  put malicious javascript code inside a Steam user 's profile page: capabilities, the code will execute whenever someone visits that profile page: capabilities, this week: time, security researchers: discoverer, Several users: 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: noticed,  put malicious javascript code inside a Steam user 's profile page: capabilities, the code will execute whenever someone visits that profile page: capabilities, this week: time, security researchers: discoverer, Several users: discoverer) 