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Earlier this week , the hacker , known only as Cipher0007 , disclosed the existence of two " high - risk " bugs through Reddit .
 the existence of two " high - risk " bugs: vulnerability; Cipher0007: discoverer; the hacker: discoverer; Earlier this week: time
Given event type and trigger, please tell me the arguments of all the listed option. Output format is "name1: role1; name2: role2". 
Event type: discover vulnerability 
  Option: vulnerable system owner, vulnerability, capabilities, time, vulnerable system version, discoverer, common vulnerabilities and exposures, supported platform, vulnerable system 
Text: {0} 
Answer:
 the existence of two " high - risk " bugs: vulnerability; Cipher0007: discoverer; the hacker: discoverer; Earlier this week: time