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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
Please tell me event type and its trigger word from given type options. Output format is "type: trigger".  Option: phishing, data breach, ransom, discover vulnerability, patch vulnerability 
Text: {0} 
Answer:
 discover vulnerability: are warning