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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 .
 ( discover vulnerability: responded quickly,  Telegram: discoverer, WhatsApp: discoverer, this issue: vulnerability, all web clients: vulnerable system) 
Locate the role in the text that participated in the event based on the event type and return it in the event list. 
 Option: Event type: phishing, data breach, ransom, discover vulnerability, patch vulnerability, Arguments type: vulnerable system, capabilities, vulnerability, number of victim, issues addressed, compromised data, damage amount, common vulnerabilities and exposures, victim, patch number, number of data, tool, discoverer, time, purpose, place, payment method, releaser, vulnerable system version, attacker, supported platform, patch, price, vulnerable system owner, trusted entity, attack pattern. 
Text: {0} 
Answer:
 ( discover vulnerability: responded quickly,  Telegram: discoverer, WhatsApp: discoverer, this issue: vulnerability, all web clients: vulnerable system) 