Unfiltered MU Security & Risk Analysis

wordpress.org/plugins/unfiltered-mu

This WordPress MU/WordPress 3.0 multisite plugin gives blog Administrators and Editors the ability to post whatever HTML they want.

2K active installs v1.3.1 PHP + WP 2.9.2+ Updated Dec 20, 2018
embedhtmliframeobjectscript
85
A · Safe
CVEs total0
Unpatched0
Last CVENever
Safety Verdict

Is Unfiltered MU Safe to Use in 2026?

Generally Safe

Score 85/100

Unfiltered MU has no known CVEs and is actively maintained. It's a solid choice for most WordPress installations.

No known CVEs Updated 7yr ago
Risk Assessment

The static analysis of the "unfiltered-mu" plugin v1.3.1 reveals a strong security posture. The plugin exhibits excellent coding practices, with zero identified AJAX handlers, REST API routes, shortcodes, or cron events. This indicates a minimal attack surface and a proactive approach to securing entry points. Furthermore, the code signals are overwhelmingly positive: no dangerous functions were detected, all SQL queries utilize prepared statements, and all identified output is properly escaped. The presence of one capability check, while singular, suggests awareness of access control. Taint analysis also shows no critical or high severity flows, reinforcing the perception of secure code execution. The plugin's vulnerability history is completely clean, with no recorded CVEs of any severity. This lack of past vulnerabilities and the current robust code analysis suggest a well-maintained and secure plugin. However, the analysis indicates a complete absence of specific security mechanisms like nonce checks. While the current attack surface is zero, if any entry points were to be introduced in the future without these checks, it could pose a risk. Overall, "unfiltered-mu" v1.3.1 appears to be a secure plugin, with no immediate threats identified, but attention to future development practices regarding nonce and permission checks is advisable.

Vulnerabilities
None known

Unfiltered MU Security Vulnerabilities

No known vulnerabilities — this is a good sign.
Code Analysis
Analyzed Mar 16, 2026

Unfiltered MU Code Analysis

Dangerous Functions
0
Raw SQL Queries
0
0 prepared
Unescaped Output
0
0 escaped
Nonce Checks
0
Capability Checks
1
File Operations
0
External Requests
0
Bundled Libraries
0
Attack Surface

Unfiltered MU Attack Surface

Entry Points0
Unprotected0
WordPress Hooks 4
actioninitunfiltered-mu.php:32
actionset_current_userunfiltered-mu.php:33
actioninitunfiltered-mu.php:88
filtermap_meta_capunfiltered-mu.php:98
Maintenance & Trust

Unfiltered MU Maintenance & Trust

Maintenance Signals

WordPress version tested5.0.25
Last updatedDec 20, 2018
PHP min version
Downloads121K

Community Trust

Rating98/100
Number of ratings14
Active installs2K
Developer Profile

Unfiltered MU Developer Profile

Donncha O Caoimh (a11n)

12 plugins · 32K total installs

73
trust score
Avg Security Score
91/100
Avg Patch Time
4657 days
View full developer profile
Detection Fingerprints

How We Detect Unfiltered MU

Patterns used to identify this plugin on WordPress sites during automated security audits and web crawling.

Asset Fingerprints

HTML / DOM Fingerprints

HTML Comments
If you install this plugin in wp-content/plugins, the following code will add the cap on plugin activation, and remove it on deactivation. It will be a per-blog setting (the plugin will need to be activated on each blog you want the unfiltered_html cap). If you install this plugin in wp-content/mu-plugins, the following code will add give all admins and all editors on every blog the unfiltered_html cap. Deleting this plugin will remove the cap. Don't store in db. Just do a one off mod to the role. Add caps for this page load only: - ^^^^^^^^+1 more
FAQ

Frequently Asked Questions about Unfiltered MU