Simple Custom CSS and JS

Simple Custom CSS and JS has one disclosed vulnerability in the WordSec catalog, all reported in 2017; it is fixed as of September 2026. Their average CVSS score is 6.1, and the most serious one scores 6.1 out of 10.

The most common weakness is Cross-Site Scripting, behind 1 of the records (100%).

The one issue recorded for Simple Custom CSS and JS has a vendor fix available, so running the current release closes it.

All of these findings were reported by Chris Liu. Simple Custom CSS and JS is installed on roughly 600,000 WordPress sites, so each unpatched flaw has a wide blast radius. The current release is tested up to WordPress 7.1.

Strategic Overview

Avg CVSSMedium

6.1/ 10

Patch Coverage100%

Open

Fixed

Get automatic notifications for all Simple Custom CSS and JS vulnerabilities before they are exploited.

Highest severity on recordCVSS 6.1CVE-2017-2285

Simple Custom CSS and JS <= 3.3 - Cross-Site Scripting

Read the full analysis

Vulnerability Records

1 records


2017-07-24 00:00	Simple Custom CSS and JS <= 3.3 - Cross-Site Scripting Simple Custom CSS and JS <= 3.3	`CVE-2017-2285`	6.1 Medium	Chris Liu	Yes

Showing 1–1 of 1 reports

Latestv3.54

Simple Custom CSS and JS

Author

SilkyPress

4.4(103)

88/100

Last Updated

2026-08-20 (24d ago)

Active Installs

600,000+

Downloads

10,917,328

Requires WP

4.2+

Requires PHP

5.2.4+

Tested up to

WP 7.1

Created

2015-12-07 (11y ago)

Customize your WordPress site’s appearance by easily adding custom CSS and JS code without even having to modify your theme or plugin files. This is perfect for adding custom CSS tweaks to your site. Features Text editor with syntax highlighting Print the code inline or included into an external file Print the code in the header or the footer Add CSS or JS to the frontend or the admin side Add as many codes as you want Keep your changes also when you change the theme

View on WordPress.org