Directory traversal vulnerability in download_file.php in PolDoc CMS (aka PDDMS) 0.96 allows remote attackers to read arbitrary files via a .. (dot dot) or absolute pathname in the filename parameter.
Improper Limitation of a Pathname to a Restricted Directory The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.