On at least some versions of this unique Linux distribution, contents of attached USB devices and Windows partitions are exposed via the network. If you're not running a router-based firewall (SplashTop has no firewall) or a dedicated hardware firewall, the contents can then be accessed anonymously. All of these files can be viewed over HTTP on port 1080.
Kano originally noted this problem in the Phoronix IRC channel and this forum thread. DeviceVM, the company behind SplashTop, is currently looking into this problem.