OpenCart Community

Today I've found this article at sucuri: https://blog.sucuri.net/2016/12/unrestr ... login.html
It describes the way how a hacker could become access to your backend very easy - if you are using an older OpenCart version.

It's not if using an older version of OpenCart. It's if any version of OpenCart has been modified by malware (or maybe a third party).

Need to check to see if system/library/user.php or system/library/cart/user.php have been modified. The malware adds a # to the the front of the WHERE statements in the SQL.