As per the documentation you quoted, and the url you've included in your quote:

correct your php.ini from:
cgi.fix_pathinfo=1

to:
cgi.fix_pathinfo=0

or just comment it out all together, as:
;cgi.fix_pathinfo=1


If you have a recent version of PHP-FPM (~5.3.9+?), then you need to do nothing, as the safe behaviour below is already the default.

Further reading at:
https://serverfault.com/questions/6...info-really-dangerous-with-nginx-php-fpm
and
https://en.wikipedia.org/wiki/Common_Gateway_Interface


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