html/index.php in TorrentFlux 2.3 allows remote authenticated users to execute arbitrary code via a URL with a file containing an executable extension in the url_upload parameter, which is downloaded by TorrentFlux and can be accessed via a direct request in a html/downloads/ user directory.
Improper Control of Generation of Code The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment.