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Researchers from Fidelis Cybersecurity have unearthed an “ interesting security issue ” involving the popular messaging app Telegram .
 ( discover vulnerability: have unearthed,  Fidelis Cybersecurity: discoverer, Researchers: discoverer, interesting security issue: vulnerability, messaging app Telegram: 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: have unearthed,  Fidelis Cybersecurity: discoverer, Researchers: discoverer, interesting security issue: vulnerability, messaging app Telegram: vulnerable system) 