Broken Access Control security issue

This has already been reported almost a year ago by @beardcat, but it received no response.

Please can you look into the Broken Access Control security issue in version 3.0.1?

Info on the issue via Patchstack: https://patchstack.com/database/wordpress/plugin/duplicate-post-page-menu-custom-post-type/vulnerability/wordpress-duplicate-post-page-menu-custom-post-type-plugin-2-3-1-broken-access-control.