I've been working on the CIS security benchmark for Oracle MySQL 5.6. There already is a benchmark document for earlier versions of MySQL.
The benchmark document helps you to ensure you have a secure configuration for MySQL.
Center for Internet Security (CIS) is a nonprofit organization.
The Call For Participation is now open.
If you are already a CIS member then you can download the document here. If you don't have an account you can register for free.