Most users are aware of the risks connected to the default, blank and weak username/password combinations associated with most applications. Given the amount of sensitive and proprietary information stored in databases, it can be argued that protecting this information is even more important. It s a common practice in the software industry to create default accounts during the installation of applications. When roles are granted to database users, they typically are able to execute a set group of commands. The increased prevalence of insider attacks mandates that you pay attention to access rights and privileges.
Source: https://threatpost.com/database-sometimes-its-little-things-matter-060310/74056/