Directory traversal vulnerability in update/index.php in PluXml before 5.1.6 allows remote attackers to include and execute arbitrary local files via a ..%2F (encoded dot dot slash) in the default_lang 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.