Example embodiments of the present disclosure provide methods, devices, and computer programs for authorization detection. The first system receives, from the second system unauthorized by the first system, a request for operating a resource of the first system. The first system causes a detection of an authorization chain to be detected based on the first record that at least indicates one or more systems that are authorized by the first system. The authorization chain includes at least a third system that authorizes the second system and is authorized by the first system. If the authorization chain is detected, the first system authorizes the operation of the resource of the first system.