Is CVE-2021-4073 actively exploited?

Yes. CVE-2021-4073 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, which means exploitation in the wild has been confirmed.

Can CVE-2021-4073 be exploited remotely?

The attack vector of CVE-2021-4073 has not been classified yet.

What is the CVSS score of CVE-2021-4073?

CVE-2021-4073 has not received a CVSS score yet.

HOME VULNERABILITIESCVE-2021-4073

UNKNOWNCISA KEVIN THE WILD

CVE-2021-4073

Published: April 11, 2026

EPSS:68.88%probability of exploitation in 30 daysPercentile:98.6th

Official 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.

NVD Source

Technical Analysis

CVE-2021-4073 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation requires some privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

CISA has added CVE-2021-4073 to the Known Exploited Vulnerabilities (KEV) catalog, confirming active exploitation in the wild. U.S. federal agencies are required to patch this within the mandated timeframe, and all organizations should treat remediation as urgent.