Known vulnerabilities in Custom CSS

Add custom CSS, JS, PHP, tracking code. Very easy to use!

1Reported vulnerabilities

5.3Highest CVSS score

1.4.0Latest version

1,000+Active installs

What to do now

Update Custom CSS to 1.4.0 or later. Some of these have no published fix. Update to the latest version and check the vendor advisory.

Plugin last updated: November 28, 2017 / Tested up to WordPress: 4.6.30 / View on wordpress.org

This plugin has not been updated in over two years. New vulnerabilities may never be fixed. Consider an alternative.

Reported vulnerabilities

Ordered by how urgently they need attention — whether a vulnerability is actually being exploited, and how likely exploitation is, rather than CVSS severity alone.

CVE	Severity	Exploit probability next 30 days	Affected versions	Fixed in	Published
CVE-2025-48096	Medium 5.3	0.3%	1.4.0 and earlier	—	October 8, 2025

Sources: vulnerability records from NVD, exploitation from CISA KEV, exploit probability from EPSS. Affected versions come from CPE ranges or from the reporting CNA.