It surprises me (well, actually, dismays me in most cases) that new websites appear online all the time who have clearly spent an inordinate amount of time on cosmetics / appearance, and decent hosting, yet failed to address the elephant in the room when it comes to actually securing the site itself. Almost all the time, when I perform a quick security audit using something simple like https://securityheaders.io, I see this
Not a pretty sight. Not only does this expose your site to unprecedented risk, but also looks bad when others decide to perform a simple (and very public) check. Worse still is the sheer number of so called "security experts" who claim to solve all of your security issues with their "silver bullet" solution (sarcasm intended), yet have neglected to get their own house in order. So that can you do to resolve this issue ? It's actually much easier than it seems. Dependant on the web server you are running, you can include these headers.
Header set X-Frame-Options "SAMEORIGIN"
header set X-XSS-Protection "1; mode=block"
Header set X-Download-Options "noopen"
Header set X-Content-Type-Options "nosniff"
Header set Content-Security-Policy "upgrade-insecure-requests"
Header set Referrer-Policy 'no-referrer' add
Header set Feature-Policy "geolocation 'self' https://yourdomain.com"
Header set Permissions-Policy "geolocation=(),midi=(),sync-xhr=(),microphone=(),camera=(),magnetometer=(),gyroscope=(),fullscreen=(self),payment=()"
Header set X-Powered-By "Whatever text you want to appear here"
Header set Access-Control-Allow-Origin "https://yourdomain.com"
Header set X-Permitted-Cross-Domain-Policies "none"
Header set Strict-Transport-Security "max-age=63072000; includeSubDomains; preload"
add_header X-Frame-Options "SAMEORIGIN" always;
add_header X-XSS-Protection "1; mode=block";
add_header X-Download-Options "noopen" always;
add_header X-Content-Type-Options "nosniff" always;
add_header Content-Security-Policy "upgrade-insecure-requests" always;
add_header Referrer-Policy 'no-referrer' always;
add_header Feature-Policy "geolocation 'self' https://yourdomain.com" always;
add_header Permissions-Policy "geolocation=(),midi=(),sync-xhr=(),microphone=(),camera=(),magnetometer=(),gyroscope=(),fullscreen=(self),payment=();";
add_header X-Powered-By "Whatever text you want to appear here" always;
add_header Access-Control-Allow-Origin "https://yourdomain.com" always;
add_header X-Permitted-Cross-Domain-Policies "none" always;
add_header Strict-Transport-Security "max-age=63072000; includeSubdomains;" always;
https://yourdomain.com should be changed to reflect your actual domain. This is just a placeholder to demonstrate how the headers need to be structured.
Restart Apache or NGINX, and then perform the test again.
That's better !
More detail around these headers can be found here