3268
In a blog post , Leonov explained that he reported the issue to Facebook in October 2016 according to which the ImageMagick flaw was still active and impacted Facebook .
 ( discover vulnerability: reported,  Facebook: vulnerable system owner, October 2016: time, the issue: vulnerability, he: discoverer) 
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: reported,  Facebook: vulnerable system owner, October 2016: time, the issue: vulnerability, he: discoverer) 