This post was last updated 8 years 5 months 3 days ago, some of the information contained here may no longer be actual and any referenced software versions may have been updated!

The Magento 1.9.2.1 release source code included the Magento Test Framework files. The Magento Test Framework (MTF) is a tool that can run automated functional tests, to assist in the development and implementation of Magento modules.

The test files are included in the Magento root /dev folder.  The files are included for development purposes and might reveal your passwords or other sensitive information when accessed with malicious intent. The /dev directories and files are not protected by default and according to Magento, “these tests are not supposed to end up on production servers”.

Do not install these files in a production environment.

Delete the /dev/ folder from your production server.
Delete the /dev/ folder after upgrading to a newer version of Magento.