3295
De Ceukelaire already warned the Facebook security team twice about this issue and stated that he might expose it to the public if the social network does not fix the issue and make necessary changes .
 ( discover vulnerability: warned,  the Facebook security team: vulnerable system owner, De Ceukelaire: discoverer, this issue: vulnerability) 
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: warned,  the Facebook security team: vulnerable system owner, De Ceukelaire: discoverer, this issue: vulnerability) 