Wp Backitup Community Edition
An issue exists where authenticated attackers with administrator-level access and above can perform Directory Traversal, a technique used to access files and directories that are stored outside the web root folder. By manipulating the `backup file` parameter, an attacker can read arbitrary files on the server that may contain sensitive information. The `basename()` normalization in the handler fails to protect existing files because it only executes when the target path does not exist.