CWE-30: Path Traversal: '\dir\..\filename'
The product uses external input to construct a pathname that should be within a restricted directory, but it does not properly neutralize '\dir\..\filename' (leading backslash dot dot) sequences that can resolve to a location that is outside of that directory.
A kind of CWE-23 Relative Path Traversal.
From the CWE List. © The MITRE Corporation.