CVE-2021-4073 json
RegistrationMagic <= 5.0.1.7 Authentication Bypass
published 2021-12-14 4 y ago modified 2026-06-17 4 mo ago also EUVD-2021-33966
- cvss
- 9.8
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 6.8%
- EPSS 6.8% chance of exploitation in 30 days, percentile 94%
- public exploits
- 0
- none known, plus a Nuclei check
Summary
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.
Patch / fix
CISA SSVC
- Exploitation
- none
- Automatable
- yes
- Technical impact
- total
- Assessed
- 20 mo ago
Exploit prediction
6.84% chance of exploitation in the next 30 days, higher than 94% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- Nuclei template RegistrationMagic <= 5.0.1.7 - Authentication Bypass nuclei detection template
- wordfence.com https://www.wordfence.com/blog/2021/12/authentication-bypass-vulnerability-patched-in-user-registration-plugin/ referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVD | 3.1 | 8.1 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVD | 2.0 | 6.8 | AV:N/AC:M/Au:N/C:P/I:P/A:P |
Affected products
- RegistrationMagic RegistrationMagic
Classification
- Weakness
-
- CWE-287 Improper Authentication
- Technology feeds
References
-
plugins.trac.wordpress.org
/changeset/2635173/custom-registration-form-builder-with-submission-manager/trunk/services/class_rm_user_servi
patch, third-party-advisory
-
wordfence.com
/blog/2021/12/authentication-bypass-vulnerability-patched-in-user-registration-plugin/
exploit, third-party-advisory
-
wordfence.com
/vulnerability-advisories/#CVE-2021-4073
third-party-advisory
Sources
- CVE List CVE-2021-4073
- NVD CVE-2021-4073
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.