> I took a look but couldn't find anything relevant to the
issue
I only skimmed the entry. But it appears to use the uploaded
file's extension to determine which file types are allowed. For
example, this line tries to verify the file is a PDF, RTF or word
document.
ie
<cfif NOT ListFindNoCase( "pdf,doc,rtf",
CFFILE.ServerFileExt )>
....
You could use a similar check to determine if the uploaded
file is a GIF or JPG (.jpg or .jpeg). Bear in mind file extensions
can be changed. So extension alone does guarantee a file is of a
particular type. It is more likely, but not a guarantee.