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In an email sent to users on 26th December , the site explained that hackers were able to conduct this breach by exploiting a known vulnerability in outdated vBulletin forum software .
 the site: discoverer; 26th December: 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 site: discoverer; 26th December: time