HOMEVULNERABILITIESCVE-2021-4343
CRITICAL

CVE-2021-4343

CWE-862Published: June 7, 2023· Updated: Jun 17, 2026

9.8
CVSS v3.1

Official Description

The Unauthenticated Account Creation plugin for WordPress is vulnerable to Unauthenticated Account Creation in versions up to, and including, 1.6.6. This is due to the stm_listing_register AJAX action function being accessible and taking roles unprotected. This makes it possible for unauthenticated attackers to create accounts, even those with administrator privileges.

NVD Source

Technical Analysis

CVE-2021-4343 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

stylemixthemes1 product(s)
ulisting
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&old=2456786%40ulisting&new=2456786%40ulisting&sfp_email=&sfph_mail=
PATCHhttps://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&old=2456786%40ulisting&new=2456786%40ulisting&sfp_email=&sfph_mail=
ADVISORYhttps://www.wordfence.com/threat-intel/vulnerabilities/id/1c6bf45b-b02d-43bb-b682-7f1ae994e1d3?source=cve
ADVISORYhttps://www.wordfence.com/threat-intel/vulnerabilities/id/1c6bf45b-b02d-43bb-b682-7f1ae994e1d3?source=cve

All References (6)

→
https://blog.nintechnet.com/wordpress-ulisting-plugin-fixed-multiple-critical-vulnerabilities/Exploit
→
https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&old=2456786%40ulisting&new=2456786%40ulisting&sfp_email=&sfph_mail=Patch
→
https://www.wordfence.com/threat-intel/vulnerabilities/id/1c6bf45b-b02d-43bb-b682-7f1ae994e1d3?source=cveThird Party Advisory
→
https://blog.nintechnet.com/wordpress-ulisting-plugin-fixed-multiple-critical-vulnerabilities/Exploit
→
https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&old=2456786%40ulisting&new=2456786%40ulisting&sfp_email=&sfph_mail=Patch
→
https://www.wordfence.com/threat-intel/vulnerabilities/id/1c6bf45b-b02d-43bb-b682-7f1ae994e1d3?source=cveThird Party Advisory

Quick Facts

CVE IDCVE-2021-4343
CVSS Score9.8 / 10
SeverityCRITICAL
WeaknessCWE-862
CISA KEVNo
Affected1 vendor(s)
PublishedJun 7, 2023

Related CVEs (CWE-862)

CVE-2025-22609
10.0
CVE-2026-33712
10.0
CVE-2024-6071
10.0
CVE-2024-33566
10.0
CVE-2024-52416
10.0
CVE-2025-30416
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2021-4343 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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