Deny access to config, content, content-sample, lib and vendor dirs

Send 404 Not Found instead of 403 Forbidden

.htaccess

@@ -5,6 +5,7 @@
     RewriteCond %{REQUEST_FILENAME} !-f
     RewriteCond %{REQUEST_FILENAME} !-d
     RewriteRule ^(.*)$ index.php?$1 [L,QSA]
+    RewriteRule ^(config|content|content-sample|lib|vendor)/.* - [R=404,L]
 
     <IfModule mod_env.c>
         SetEnv PICO_URL_REWRITING 1