2105
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,  allow hackers to gain access: capabilities, cyber security firm Check Point: discoverer, Telegram: vulnerable system, messenger apps: vulnerable system, A flaw: vulnerability, designed to keep them out: capabilities, the very encryption software: vulnerable system, WhatsApp: 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: has been discovered,  allow hackers to gain access: capabilities, cyber security firm Check Point: discoverer, Telegram: vulnerable system, messenger apps: vulnerable system, A flaw: vulnerability, designed to keep them out: capabilities, the very encryption software: vulnerable system, WhatsApp: vulnerable system) 