There are WordPress htaccess file code additions that can help with security and performance. The file named .htaccess defines the access rules for your website. Following is code that can be added to your .htaccess file. Keep your custom .htaccess additions before and outside of the “# BEGIN WordPress” and “# END WordPress” tags.
WordPress htaccess File Code Additions to Prevent SQL Injection & URL Hacking
This code will strip URL requests of many dangerous attack injections.
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteCond %{REQUEST_METHOD} ^(HEAD|TRACE|DELETE|TRACK) [NC]
RewriteRule ^(.*)$ - [F,L]
RewriteCond %{QUERY_STRING} ../ [NC,OR]
RewriteCond %{QUERY_STRING} boot.ini [NC,OR]
RewriteCond %{QUERY_STRING} tag= [NC,OR]
RewriteCond %{QUERY_STRING} ftp: [NC,OR]
RewriteCond %{QUERY_STRING} http: [NC,OR]
RewriteCond %{QUERY_STRING} https: [NC,OR]
RewriteCond %{QUERY_STRING} (<|%3C).*script.*(>|%3E) [NC,OR]
RewriteCond %{QUERY_STRING} mosConfig_[a-zA-Z_]{1,21}(=|%3D) [NC,OR]
RewriteCond %{QUERY_STRING} base64_encode.*(.*) [NC,OR]
RewriteCond %{QUERY_STRING} ^.*([|]|(|)|<|>|ê|"|;|?|*|=$).* [NC,OR]
RewriteCond %{QUERY_STRING} ^.*("|'|<|>|\|{||).* [NC,OR]
RewriteCond %{QUERY_STRING} ^.*(%24&x).* [NC,OR]
RewriteCond %{QUERY_STRING} ^.*(%0|%A|%B|%C|%D|%E|%F|127.0).* [NC,OR]
RewriteCond %{QUERY_STRING} ^.*(globals|encode|localhost|loopback).* [NC,OR]
RewriteCond %{QUERY_STRING} ^.*(request|select|insert|union|declare).* [NC]
RewriteCond %{HTTP_COOKIE} !^.*wordpress_logged_in_.*$
RewriteRule ^(.*)$ - [F,L]
</IfModule>
WordPress .htaccess File Code Additions to Prevent Access to Sensitive Files
Blocks access to directory listings, plus a set of specific files related to WordPress and the Web server itself.
Options All -Indexes <files .htaccess> Order allow,deny Deny from all </files> <files readme.html> Order allow,deny Deny from all </files> <files license.txt> Order allow,deny Deny from all </files> <files install.php> Order allow,deny Deny from all </files> <files wp-config.php> Order allow,deny Deny from all </files> <files error_log> Order allow,deny Deny from all </files> <files fantastico_fileslist.txt> Order allow,deny Deny from all </files> <files fantversion.php> Order allow,deny Deny from all </files>