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Although maintainers of the open source project patched the vulnerability on Monday , it remains under attack by hackers who are exploiting it to inject commands of their choice into Struts servers that have yet to install the update , researchers are warning .
 ( discover vulnerability: are warning,  researchers: 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: are warning,  researchers: discoverer) 