CVE-2021-4427Public exploitNetwork attack vector

Settings modification via missing nonce validation

Published Jul 12, 2023 · Updated Apr 8, 2026

Cross-site request forgery in Vuukle Comments, Reactions, Share Bar, Revenue 3.4.31 and earlier allows attackers to modify plugin settings. The admin settings handler in /admin/partials/free-comments-for-wordpress-vuukle-admin-display.php processes state-changing input without correctly validating a WordPress nonce. Exploitation requires remote attackers to induce a logged-in site administrator to submit a forged request, and the documented consequence is limited to changing plugin settings.

CVSS severity4.3
Medium
EPSS probability0.56%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site request forgery in Vuukle Comments, Reactions, Share Bar, Revenue 3.4.31 and earlier allows attackers to modify plugin settings. The admin settings handler in /admin/partials/free-comments-for-wordpress-vuukle-admin-display.php processes state-changing input without correctly validating a WordPress nonce. Exploitation requires remote attackers to induce a logged-in site administrator to submit a forged request, and the documented consequence is limited to changing plugin settings.

The record

CVE
CVE-2021-4427
Published
Jul 12, 2023
Updated
Apr 8, 2026
Vendor
Vuukle
Product
Vuukle
Classifications
CWE-352, T1204.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 12, 2023CVE publishedPublication date reported by the CVE source.
  2. Apr 8, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=3.4.31

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Vuukle · Vuukleversion=0 <=3.4.31

Published CVSS scores

4.3WordfenceCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-352Cross-Site Request Forgery (CSRF)
T1204.001User Execution: Malicious Link

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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