CVE-2021-4427

Name: CVE-2021-4427
Creator: NVD / NIST
Published: 2023-07-12T08:15:09.727+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 4.3/10EPSS 0.50%

Last modified Jun 17, 2026

CVE-2021-4427 is a medium-severity vulnerability rated 4.3/10 on the CVSS scale. The Vuukle Comments, Reactions, Share Bar, Revenue plugin for WordPress is vulnerable to Cross-Site Request Forgery in versions up to, and including, 3.4.31. This is due to missing or incorrect nonce validation in the /admin/partials/free-comments-for-wordpress-vuukle-admin-display.php file. EPSS estimates a 0.50% chance of exploitation in the next 30 days.

Description

The Vuukle Comments, Reactions, Share Bar, Revenue plugin for WordPress is vulnerable to Cross-Site Request Forgery in versions up to, and including, 3.4.31. This is due to missing or incorrect nonce validation in the /admin/partials/free-comments-for-wordpress-vuukle-admin-display.php file. This makes it possible for unauthenticated attackers to edit the plugins settings via a forged request granted they can trick a site administrator into performing an action such as clicking on a link.

Metrics

CVSS 3.1

4.3/10

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

EPSS Probability

0.50%

38.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-352

Affected Software

Vendor	Product	Versions
Vuukle	Vuukle Comments\, Reactions\, Share Bar\, Revenue	<= 3.4.31

References

https://blog.nintechnet.com/25-wordpress-plugins-vulnerable-to-csrf-attacks/Exploit, Third Party Advisory
https://blog.nintechnet.com/more-wordpress-plugins-and-themes-vulnerable-to-csrf-attacks/Exploit, Third Party Advisory
https://blog.nintechnet.com/multiple-wordpress-plugins-fixed-csrf-vulnerabilities-part-1/Exploit, Third Party Advisory
https://blog.nintechnet.com/multiple-wordpress-plugins-fixed-csrf-vulnerabilities-part-2/Exploit, Third Party Advisory
https://blog.nintechnet.com/multiple-wordpress-plugins-fixed-csrf-vulnerabilities-part-3/Exploit, Third Party Advisory
https://blog.nintechnet.com/multiple-wordpress-plugins-fixed-csrf-vulnerabilities-part-4/Exploit, Third Party Advisory
https://blog.nintechnet.com/multiple-wordpress-plugins-fixed-csrf-vulnerabilities-part-5/Exploit, Third Party Advisory
https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&old=2553337%40free-comments-for-wordpress-vuukle&new=2553337%40free-comments-for-wordpress-vuukle&sfp_email=&sfph_mail=Patch
https://www.wordfence.com/threat-intel/vulnerabilities/id/ff28f33f-85d1-4987-975b-ee3bbcb394f4?source=cveExploit, Patch, Third Party Advisory
https://blog.nintechnet.com/25-wordpress-plugins-vulnerable-to-csrf-attacks/Exploit, Third Party Advisory
https://blog.nintechnet.com/more-wordpress-plugins-and-themes-vulnerable-to-csrf-attacks/Exploit, Third Party Advisory
https://blog.nintechnet.com/multiple-wordpress-plugins-fixed-csrf-vulnerabilities-part-1/Exploit, Third Party Advisory
https://blog.nintechnet.com/multiple-wordpress-plugins-fixed-csrf-vulnerabilities-part-2/Exploit, Third Party Advisory
https://blog.nintechnet.com/multiple-wordpress-plugins-fixed-csrf-vulnerabilities-part-3/Exploit, Third Party Advisory
https://blog.nintechnet.com/multiple-wordpress-plugins-fixed-csrf-vulnerabilities-part-4/Exploit, Third Party Advisory
https://blog.nintechnet.com/multiple-wordpress-plugins-fixed-csrf-vulnerabilities-part-5/Exploit, Third Party Advisory
https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&old=2553337%40free-comments-for-wordpress-vuukle&new=2553337%40free-comments-for-wordpress-vuukle&sfp_email=&sfph_mail=Patch
https://www.wordfence.com/threat-intel/vulnerabilities/id/ff28f33f-85d1-4987-975b-ee3bbcb394f4?source=cveExploit, Patch, Third Party Advisory

Timeline

Published: Jul 12, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-4427?

How severe is CVE-2021-4427?

CVE-2021-4427 has a CVSS score of 4.3/10 (MEDIUM severity). The EPSS model estimates a 0.50% probability of exploitation in the next 30 days.

How do I fix CVE-2021-4427?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-4427?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST