As noted on other cffile upload questions,
GetPageContext().formScope().getUploadResource("myFormField").getName()
is great for getting the filename on the server before actually doing the cffile (for Railo and Lucee - there's a different method for ColdFusion) but I noticed an interesting wrinkle: if the browser is IE then this returns the full source path including the filename. Firefox and Chrome on the other hand, return only the filename.
For my application I need the full path, but haven't been able to find that when the browser is FireFox or Chrome. If anyone has any ideas I would be most grateful!