Unfiltered MU gives Administrators and Editors the
unfiltered_html capability. This prevents WordPress MU/WordPress 3.0 multisite from stripping
<embed>, etc. from these users’ posts. Authors and Contributors do not get this capability for security reasons.
The plugin can either be used globally for your entire MU site, or it can be applied on a blog-by-blog basis.
For WordPress MU or WordPress 3.0 multisite only. Regular WordPress already offers this feature and does not need this plugin.
If you use this plugin your site will be hacked in one way or another if you allow anonymous users on the Internet to create blogs on your site. It’s very dangerous.
Are you still 100% sure you want to use this plugin?
Worked great for me.
Looks like this plugin still does the trick. If it doesn't work for you or you'd rather not use a plugin, getting this functionality can be as simple as calling:
For more info, check out my blog post about how to disable kses. (http://endorkins.com/2013/08/27/disable-wordpress-kses-to-prevent-html-filtering/)