The Envolve Plugin plugin for WordPress is vulnerable to arbitrary file deletion in all versions up to, and including, 1.0 via the 'zetra_deleteLanguageFile' and 'zetra_deleteFontsFile' functions. This is due to the plugin not properly validating a file or its path prior to deleting it. This makes it possible for unauthenticated attackers to delete language files.
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.