John Godley

HTML Purified replaces the default WordPress comments filters with HTML Purifier, a super HTML filtering 
library.
<blockquote>
HTML Purifier is a standards-compliant HTML filter library written in PHP. HTML Purifier will 
 not only remove all malicious code (better known as XSS) with a thoroughly audited, secure yet 
 permissive whitelist, it will also make sure your documents are standards compliant, something 
 only achievable with a comprehensive knowledge of W3C’s specifications.
</blockquote>
An additional feature of HTML Purifier is that it will produce valid well-formed XHTML code, something 
which KSES does not do.
Features:
<ul>
<li>Configurable KSES or HTML Purifier</li>
<li>Configurable list of HTML elements and attributes for both KSES and HTML purifier</li>
<li>Additionally process comments with HTML Tidy</li>
<li>URL blacklist</li>
<li>Fully localized (and awaiting translations)</li>
<li>Automatically escape PHP or anything inside backticks</li>
</ul>
HTML Purifier is available in:
<ul>
<li>English</li>
<li>Spanish, thanks to José Cuesta</li>
<li>Belorussian, thanks to Marcis Gasuns</li>
<li>Russian, thanks to Ilyuha</li>
<li>Uzbekistan, thanks to Alexandra Bolshova</li>
<li>Dutch, thanks to Pieter</li>
<li>German, thanks to Andreas Beraz</li>
<li>Polish, thanks to Kasia Ciszewski & Dawid Śpiechowicz</li>
<li>Romanian, thanks to Alina @ InboxTranslations.com</li>
<li>Lithuanian, thanks to Nata Strazda</li>
<li>Ukranian, thanks to Iflexion Design</li>
</ul>
<h3>Documentation</h3>
Full documentation can be found on the <a href="http://urbangiraffe.com/plugins/html-purified/" rel="nofollow ugc">HTML Purified</a> page.

HTML Purified

HTML Purified replaces the default comments filters with the more secure HTML Purifier.

Patrick Sletvold

Content Security Policy Manager is a WordPress plugin that allows you to easily configure <a href="https://developer.mozilla.org/en-US/docs/Web/HTTP/CSP" rel="nofollow ugc">Content Security Policy headers</a> for your site. You can have different CSP headers for the admin interface, the frontend for logged in users, and the frontend for regular visitors. The CSP directives can be individually enabled, and each policy can be set to enforce, report or be disabled.
Please note that this plugin offers limited help in figuring out what the contents of the policy should be. It only lets you configure the CSP in a easy to use interface.

Content Security Policy Manager

Plugin for configuring Content Security Policy headers for your site. Allows different CSP headers for admin, logged inn frontend and regular visitors

HTML Purified vs Content Security Policy Manager