Unfiltered MU
This WordPress MU/WordPress 3.0 multisite plugin gives blog Administrators and Editors the ability to post whatever HTML they want.
Consider an alternative
Unfiltered MU shows warning signs in 2026 — compare the alternatives below before installing. It runs on 3K+ sites, is rated 4.9/5 and was last updated 8 years ago, and scores 40/100 on our health check.
- Momentum — downloads up 45.1% vs the previous 30 days
- No update in 7 years
- Only tested up to WordPress 5.0 (latest is 7.1)
How does it stack up?
Side-by-side on installs, updates, ratings & support
Daily downloads
Download spikes usually follow a new release — each site that auto-updates counts as a download.
Rankings
Where Unfiltered MU stands todayWordPress.org search rankings
Live position in the plugin search, top 100| Keyword | Position |
|---|---|
| embed | >100 |
| html | >100 |
| iframe | >100 |
| object | >100 |
| script | >100 |
Version adoption
Share of active sites per release.
Rating breakdown
★★★★★★★★★★ 4.9 from 14 reviews
About Unfiltered MU
From the official readme · v1.3.1Description
Unfiltered MU gives Administrators and Editors the unfiltered_html capability. This prevents WordPress MU/WordPress 3.0 multisite from stripping <iframe>, <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.
Warning! This is a very dangerous plugin to activate if you have untrusted users on your site. Any user could add Javascript code to steal the login cookies of any visitor who runs a blog on the same site. The rogue user can then inpersonate any of those users and wreak havoc. If all you want is to display videos on your WordPress MU blogs, use the native Embed Support, Viper’s Video Quicktags or any of the other video plugins on WordPress.org.
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?
Installation
If you want to enable this feature on all blogs on your MU site:
- Place the
unfiltered-mu.phpfile in yourwp-content/mu-plugins/directory. That’s it. Removing the plugin will remove the capability.
If you want to enable this feature on a blog-by-blog basis:
- Place the
unfiltered-mu.phpfile in yourwp-content/plugins/directory. - Activate this plugin for those blogs on which you want this feature enabled or enable it sitewide with the “network activate” feature. Deactivating the plugin will remove the capablitiy for that blog.
For developers
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FAQ
Unfiltered MU: quick answers
Straight answers, pulled from live WordPress.org data.
Live data from WordPress.org · checked Sep 26, 2026
Is Unfiltered MU free?
Yes. Unfiltered MU is free to download and use from the official WordPress.org plugin directory.
Is Unfiltered MU safe to use in 2026?
Unfiltered MU shows warning signs in 2026 — compare the alternatives below before installing. It runs on 3K+ sites, is rated 4.9/5 and was last updated 8 years ago, and scores 40/100 on our health check.
How many websites use Unfiltered MU?
Unfiltered MU is active on 3K+ WordPress websites and has been downloaded 126,162 times since it launched in May 2008. It was downloaded 1,136 times in the last 30 days.
Does Unfiltered MU work with WordPress 7.1?
Unfiltered MU is officially tested up to WordPress 5.0.29, while the latest release is 7.1.2. It may still work, but try it on a staging site first.
When was Unfiltered MU last updated?
The latest version, 1.3.1, was released on December 20, 2018 (8 years ago).
Who makes Unfiltered MU?
Unfiltered MU is developed and maintained by Donncha O Caoimh (a11n).
What are the best alternatives to Unfiltered MU?
The most popular alternatives to Unfiltered MU are EmbedPress (100K+ installs), iframe (60K+ installs) and Advanced iFrame (40K+ installs).
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