MinMax CMS from MinMax Digital Technology contains a hidden administrator account with a fixed password that cannot be removed or disabled from the management interface. Remote attackers who obtain this account can bypass IP access control restrictions and log in to the backend system without being recorded in the system logs.
https://www.twcert.org.tw/tw/cp-132-7828-c08b8-1.html
https://www.twcert.org.tw/en/cp-139-7831-b9a46-2.html
https://www.chtsecurity.com/news/6b2393f5-3041-4011-b2ea-528e312c6b3c
https://www.chtsecurity.com/news/2dde8d39-59fc-4c09-b4ad-0acf692321c5