Hello and thank you everybody for your replies.
I have already checked everything suggested without luck.
The point is that somebody can reproduce the issue easily by using PHP-FPM to a domain.
If your website is based in joomla or wordpress you will see the "403 Forbidden" as all your php files will get 640 permissions.
Yes i know how to fix it manually but as this forum is to report bugs i just wanted to report that this issue has affect to latest versions of CWP7.