The Sreamit theme for WordPress is vulnerable to arbitrary file downloads in all versions up to, and including, 4.0.1. This is due to insufficient file validation in the 'st_send_download_file' function. This makes it possible for authenticated attackers, with subscriber-level access and above, to download arbitrary files.
The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.