Unrestricted file upload vulnerability in calendar_admin.asp in Full Revolution aspWebCalendar 2008 allows remote attackers to upload and execute arbitrary code via the FILE1 parameter in an uploadfileprocess action, probably followed by a direct request to the file in calendar/eventimages/.
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.