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“ Thankfully , WhatsApp and Telegram responded quickly and responsibly to deploy the mitigation against exploitation of this issue in all web clients , ” Check Point Head of Product Vulnerability Oded Vanunu said .
 Telegram: discoverer; WhatsApp: discoverer; this issue: vulnerability; all web clients: 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:
 Telegram: discoverer; WhatsApp: discoverer; this issue: vulnerability; all web clients: vulnerable system