CVE-2021-4073

Name: CVE-2021-4073
Creator: NVD / NIST
Published: 2021-12-14T16:15:09.833+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.1/10EPSS 7.00%

Last modified Jun 17, 2026

CVE-2021-4073 is a high-severity vulnerability rated 8.1/10 on the CVSS scale. The RegistrationMagic WordPress plugin made it possible for unauthenticated users to log in as any site user, including administrators, if they knew a valid username on the site due to missing identity validation in the social login function social_login_using_email() of the plugin. This affects versions equal to, and less than, 5.0.1.7.. EPSS estimates a 7.00% chance of exploitation in the next 30 days.

Description

The RegistrationMagic WordPress plugin made it possible for unauthenticated users to log in as any site user, including administrators, if they knew a valid username on the site due to missing identity validation in the social login function social_login_using_email() of the plugin. This affects versions equal to, and less than, 5.0.1.7.

Metrics

CVSS 3.1

8.1/10

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

EPSS Probability

7.00%

93.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-287

Affected Software

Vendor	Product	Versions
Metagauss	Registrationmagic	<= 5.0.1.7

References

https://plugins.trac.wordpress.org/changeset/2635173/custom-registration-form-builder-with-submission-manager/trunk/services/class_rm_user_services.phpPatch, Third Party Advisory
https://www.wordfence.com/blog/2021/12/authentication-bypass-vulnerability-patched-in-user-registration-plugin/Exploit, Third Party Advisory
https://www.wordfence.com/vulnerability-advisories/#CVE-2021-4073Third Party Advisory
https://plugins.trac.wordpress.org/changeset/2635173/custom-registration-form-builder-with-submission-manager/trunk/services/class_rm_user_services.phpPatch, Third Party Advisory
https://www.wordfence.com/blog/2021/12/authentication-bypass-vulnerability-patched-in-user-registration-plugin/Exploit, Third Party Advisory
https://www.wordfence.com/vulnerability-advisories/#CVE-2021-4073Third Party Advisory

Timeline

Published: Dec 14, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-4073?

How severe is CVE-2021-4073?

CVE-2021-4073 has a CVSS score of 8.1/10 (HIGH severity). The EPSS model estimates a 7.00% probability of exploitation in the next 30 days.

How do I fix CVE-2021-4073?

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-2021-4073?

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

Scan your code now

Source: NVD / NIST