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As part of Unit 42 ’s ongoing threat research , we can now disclose that Palo Alto Networks Unit 42 researchers have discovered two code execution vulnerabilities affecting Microsoft Office that were addressed in Microsoft ’s May 2017 monthly security update release : For current customers with a Threat Prevention subscription , Palo Alto Networks has also released IPS signatures providing proactive protection from these vulnerabilities .
 ( discover vulnerability: disclose,  we: discoverer, Unit 42: 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: disclose,  we: discoverer, Unit 42: discoverer) 