← Vulnerability feed

Vulnerability record · CVE-2021-4073 · published 14 December 2021

CVE-2021-4073: Metagauss registrationmagic improper authentication vulnerability

Metagauss · Registrationmagic

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.

8.1 CVSS 3.1 High EPSS 7.0% · top 6.1% CWE-287 · Improper authentication
8.1CVSS 3.1 base score, v2 6.8
7.0%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
6References, 2 tagged exploit
17 Jun 2026Last modified by NVD

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.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

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

Track CVE-2021-4073 inside VULONE

Watch it alongside the ransomware crews, C2 infrastructure and forum chatter that reference it, query it through the API and pull it into your SIEM over TAXII.

Start free Open in platform

Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2017-20208Metagauss registrationmagic deserialization of untrusted data vulnerabilityThe RegistrationMagic – Custom Registration Forms, User Registration, Payment, and User Login plugin for WordPress is vulnerable to PHP Object Inject…EPSS 0.71%9.8CVE-2024-10508Metagauss registrationmagic vulnerabilityThe RegistrationMagic – User Registration Plugin with Custom Registration Forms plugin for WordPress is vulnerable to privilege escalation via accoun…EPSS 1.5%9.8CVE-2024-25935Metagauss registrationmagic missing authorization vulnerabilityMissing Authorization vulnerability in Metagauss RegistrationMagic.This issue affects RegistrationMagic: from n/a through 5.2.5.9.EPSS 0.40%9.8CVE-2023-2499Metagauss registrationmagic authentication bypass via alternate path vulnerabilityThe RegistrationMagic plugin for WordPress is vulnerable to authentication bypass in versions up to, and including, 5.2.1.0. This is due to insuffici…EPSS 1.3%8.8CVE-2024-1990Metagauss registrationmagic sql injection vulnerabilityThe RegistrationMagic – Custom Registration Forms, User Registration, Payment, and User Login plugin for WordPress is vulnerable to blind SQL Injecti…EPSS 0.82%8.8CVE-2024-1991Metagauss registrationmagic missing authorization vulnerabilityThe RegistrationMagic – Custom Registration Forms, User Registration, Payment, and User Login plugin for WordPress is vulnerable to privilege escalat…EPSS 0.89%8.8CVE-2023-47645Metagauss registrationmagic cross-site request forgery vulnerabilityCross-Site Request Forgery (CSRF) vulnerability in RegistrationMagic RegistrationMagic – Custom Registration Forms, User Registration, Payment, and U…EPSS 0.26%8.8CVE-2023-25991Metagauss registrationmagic cross-site request forgery vulnerabilityCross-Site Request Forgery (CSRF) vulnerability in RegistrationMagic plugin <= 5.1.9.2 versions.EPSS 0.25%

Source: NIST National Vulnerability Database (record CVE-2021-4073), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.