2499
A line of stuffed animals , these connected toys combine with a mobile application that was vulnerable due to a number of weak APIs , which did n’t verify who sent messages .
 ( discover vulnerability: was vulnerable,  a mobile application: vulnerable system, these connected toys: vulnerable system, a number of weak APIs: 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: was vulnerable,  a mobile application: vulnerable system, these connected toys: vulnerable system, a number of weak APIs: vulnerability) 