The WP Editor plugin for WordPress is vulnerable to arbitrary file update due to missing file path validation in all versions up to, and including, 1.2.9.1. This makes it possible for authenticated attackers, with Administrator-level access and above, to overwrite arbitrary files on the affected site's server which may make remote code execution possible assuming the files can be written to by the web server.
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.