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De Ceukelaire already warned the Facebook security team twice about this issue and stated that he might expose it to the public if the social network does not fix the issue and make necessary changes .
 the Facebook security team: vulnerable system owner; De Ceukelaire: discoverer; this issue: vulnerability
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 Facebook security team: vulnerable system owner; De Ceukelaire: discoverer; this issue: vulnerability