CVE-2021-4418

Custom CSS, JS & PHP <= 2.0.7 - Cross-Site Request Forgery Bypass

The Custom CSS, JS & PHP plugin for WordPress is vulnerable to Cross-Site Request Forgery in versions up to, and including, 2.0.7. This is due to missing or incorrect nonce validation on the save() function. This makes it possible for unauthenticated attackers to save code snippets via a forged request granted they can trick a site administrator into performing an action such as clicking on a link.

Affected

flippercode · Custom css-js-php

CVSS v3.1 NVD

4.3 MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N

EPSS

0.39% chance of exploitation in the next 30 days, 32nd percentile

Published

2023-10-20

Updated

2026-04-08

Proof-of-concept exploits (1)

• https://blog.nintechnet.com/multiple-wordpress-plugins-fixed-csrf-vulnerabilities-part-2/

Security advisories

• https://blog.nintechnet.com/multiple-wordpress-plugins-fixed-csrf-vulnerabilities-part-2
• https://www.wordfence.com/threat-intel/vulnerabilities/id/d21dc02f-789c-497e-9d01-02fa49b…
• https://plugins.trac.wordpress.org/browser/custom-css-js-php/trunk/modules/code/model.cod…

References

• CVE Record
• NVD entry