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On Tuesday , Mohamed Baset , a security analyst at ecommerce firm Linio México , published a proof - of - concept video demonstrating what he calls a Facebook flaw that allows an attacker to access audio or video files from Facebook servers and play them back .
 ( discover vulnerability: published,  Mohamed Baset: discoverer, Tuesday: time) 
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: published,  Mohamed Baset: discoverer, Tuesday: time) 