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Qubes OS , an operating system that uses Xen to isolate applications inside virtual machines , also put out an advisory warning that an attacker who exploits another vulnerability , for example inside a browser , can exploit this Xen issue to compromise the whole Qubes system .
 discover vulnerability: put out an advisory warning
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: put out an advisory warning