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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 , ” said Oded Vanunu , head of product vulnerability research at Check Point .
 this issue: vulnerability; web clients: vulnerable system; Telegram: discoverer; WhatsApp: discoverer
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:
 this issue: vulnerability; web clients: vulnerable system; Telegram: discoverer; WhatsApp: discoverer