Now WordPress 4.2.2 searches for these HTML-files and removes them. However, the search is performed only in wp-content/plugins and wp-content/themes, which is why we recommend you to check all root directory, for example via SSH:
find /path/to/wordpress -name example.html
Apart from this, other bugs from the previous versions of WordPress were fixed as well.
To see the full list of WordPress updates, click here .
If your WordPress website hasn’t updated to WordPress 4.2.2 automatically, you can do this manually in the admin panel: Dashboard → Updates and click ‘Update now’.