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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
Please tell me event type and its trigger word from given type options. Output format is "type: trigger".  Option: phishing, data breach, ransom, discover vulnerability, patch vulnerability 
Text: {0} 
Answer:
 discover vulnerability: disclose