3398
Claims of a backdoor in WhatsApp that could be used for third - party snooping were shot down by WhatsApp , which called the allegations false .
 ( discover vulnerability: Claims,  a backdoor: vulnerability, WhatsApp: vulnerable system, be used for third - party snooping: capabilities) 
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: Claims,  a backdoor: vulnerability, WhatsApp: vulnerable system, be used for third - party snooping: capabilities) 