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The US Postal Service has fixed a security bug in its website that allowed anyone with an account to see the account details of the site 's 60 million users .
 patch vulnerability: has fixed
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:
 patch vulnerability: has fixed