Modular Custom CSS Security & Risk Analysis

wordpress.org/plugins/modular-custom-css

WordPress core provides custom CSS functionality in the customizer that's specific to the current theme; you can switch themes freely with each t …

400 active installs v2.2 PHP + WP 4.9+ Updated Jul 19, 2026
csscustom-csscustom-designcustomizer
100
A · Safe
CVEs total0
Unpatched0
Last CVENever
Safety Verdict

Is Modular Custom CSS Safe to Use in 2026?

Generally Safe

Score 100/100

Modular Custom CSS has no known CVEs and is actively maintained. It's a solid choice for most WordPress installations.

No known CVEs Updated 2mo ago
Risk Assessment

The "modular-custom-css" plugin version 2.1 demonstrates a strong security posture in several key areas. The absence of any AJAX handlers, REST API routes, shortcodes, or cron events significantly limits its attack surface. Furthermore, the plugin's code signals show no dangerous functions, no raw SQL queries (all using prepared statements), and no file operations or external HTTP requests. This indicates a conscious effort to avoid common plugin vulnerabilities. The vulnerability history being completely clear of any recorded CVEs further reinforces this positive assessment. However, a significant concern arises from the output escaping. With two total outputs analyzed and 0% properly escaped, there is a high risk of Cross-Site Scripting (XSS) vulnerabilities. This lack of output sanitization is a critical weakness that could allow attackers to inject malicious scripts into the website, impacting users who interact with the affected output. While the plugin is strong in preventing certain types of attacks, the unescaped output represents a notable vulnerability that needs immediate attention.

Key Concerns

  • Unescaped output detected
Vulnerabilities
None known

Modular Custom CSS Security Vulnerabilities

No known vulnerabilities — this is a good sign.
Version History

Modular Custom CSS Release Timeline

v2.2Current
v2.1
v2.0
v1.0
Code Analysis
Analyzed Mar 16, 2026

Modular Custom CSS Code Analysis

Dangerous Functions
0
Raw SQL Queries
0
0 prepared
Unescaped Output
2
0 escaped
Nonce Checks
0
Capability Checks
0
File Operations
0
External Requests
0
Bundled Libraries
0

Output Escaping

0% escaped2 total outputs
Attack Surface

Modular Custom CSS Attack Surface

Entry Points0
Unprotected0
WordPress Hooks 3
actioncustomize_registermodular-custom-css.php:104
actioncustomize_preview_initmodular-custom-css.php:114
actionwp_headmodular-custom-css.php:131
Maintenance & Trust

Modular Custom CSS Maintenance & Trust

Maintenance Signals

WordPress version tested7.0.2
Last updatedJul 19, 2026
PHP min version
Downloads19K

Community Trust

Rating100/100
Number of ratings6
Active installs400
Developer Profile

Modular Custom CSS Developer Profile

Nick Halsey

29 plugins · 22K total installs

88
trust score
Avg Security Score
91/100
Avg Patch Time
8 days
View full developer profile
Detection Fingerprints

How We Detect Modular Custom CSS

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

Asset Fingerprints

Asset Paths
/wp-content/plugins/modular-custom-css/modular-custom-css-preview.js
Script Paths
/wp-content/plugins/modular-custom-css/modular-custom-css-preview.js

HTML / DOM Fingerprints

FAQ

Frequently Asked Questions about Modular Custom CSS