Starter Templates < 4.4.42 - Author+ Arbitrary File Upload via WXR Upload Bypass

Description

The plugin is vulnerable to arbitrary file upload due to insufficient file type validation detecting WXR files, allowing double extension files to bypass sanitization while being accepted as a valid WXR file. This makes it possible for authenticated attackers, with author-level access and above, to upload arbitrary files on the affected site's server which may make remote code execution possible.