The client in Jetro COCKPIT Secure Browsing (JCSB) 4.3.1 and 4.3.3 does not validate the FileName element in an RDP_FILE_TRANSFER document, which allows remote JCSB servers to execute arbitrary programs by providing a .EXE extension.
The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.