A vulnerability in the Trend Micro InterScan Messaging Security Virtual Appliance 9.0 and 9.1 management portal could allow an unauthenticated user to access sensitive information in a particular log file that could be used to bypass authentication on vulnerable installations.
https://success.trendmicro.com/solution/1119277
https://success.trendmicro.com/jp/solution/1119290
https://korelogic.com/Resources/Advisories/KL-001-2018-006.txt