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A flaw in popular messenger apps WhatsApp and Telegram , which could allow hackers to gain access to hundreds of millions of accounts using the very encryption software designed to keep them out , has been discovered by cyber security firm Check Point .
 discover vulnerability: has been discovered
Please tell me event type and its trigger word from given type options. Output format is "type: trigger".  Option: phishing, data breach, ransom, discover vulnerability, patch vulnerability 
Text: {0} 
Answer:
 discover vulnerability: has been discovered