2467
Researchers from Fidelis Cybersecurity have unearthed an “ interesting security issue ” involving the popular messaging app Telegram .
 Fidelis Cybersecurity: discoverer; Researchers: discoverer; interesting security issue: vulnerability; messaging app Telegram: vulnerable system
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:
 Fidelis Cybersecurity: discoverer; Researchers: discoverer; interesting security issue: vulnerability; messaging app Telegram: vulnerable system