Directory traversal vulnerability in apps/files_trashbin/index.php in ownCloud Server before 5.0.6 allows remote authenticated users to access arbitrary files via a .. (dot dot) in the dir 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.