Systems and techniques for an automatic graph-based detection of unlikely file possession are described herein. In an example, a system for detecting unauthorized file possession is adapted to generate a networked computing environment graph for files and the devices which store the files. The detection system may be further adapted to identify a file in question and a device in question that is in possession of the file in question. The detection system may be further adapted to generate a set of connection paths from the device in question to the file in question based upon the edges of the graph. The detection system may be further adapted to determine the device in question should not have possession of the file in question based on a set of metrics derived from the connection paths. The detection system may be further adapted to generate an alert based on the determination.