CVE-2021-39353

Name: CVE-2021-39353
Creator: NVD / NIST
Published: 2021-11-19T16:15:07.847+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 0.70%

Last modified Jun 17, 2026

CVE-2021-39353 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. The Easy Registration Forms WordPress plugin is vulnerable to Cross-Site Request Forgery due to missing nonce validation via the ajax_add_form function found in the ~/includes/class-form.php file which made it possible for attackers to inject arbitrary web scripts in versions up to, and including 2.1.1.. EPSS estimates a 0.70% chance of exploitation in the next 30 days.

Description

The Easy Registration Forms WordPress plugin is vulnerable to Cross-Site Request Forgery due to missing nonce validation via the ajax_add_form function found in the ~/includes/class-form.php file which made it possible for attackers to inject arbitrary web scripts in versions up to, and including 2.1.1.

Metrics

CVSS 3.1

8.8/10

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

EPSS Probability

0.70%

48.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-352

Affected Software

Vendor	Product	Versions
Easyregistrationforms	Easy Registration Forms	<= 2.1.1

References

https://plugins.trac.wordpress.org/browser/easy-registration-forms/tags/2.1.1/includes/class-form.php#L256Third Party Advisory
https://www.wordfence.com/vulnerability-advisories/#CVE-2021-39353Third Party Advisory
https://plugins.trac.wordpress.org/browser/easy-registration-forms/tags/2.1.1/includes/class-form.php#L256Third Party Advisory
https://www.wordfence.com/vulnerability-advisories/#CVE-2021-39353Third Party Advisory

Timeline

Published: Nov 19, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-39353?

How severe is CVE-2021-39353?

CVE-2021-39353 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 0.70% probability of exploitation in the next 30 days.

How do I fix CVE-2021-39353?

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-2021-39353?

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

Scan your code now

Source: NVD / NIST