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Simple CAPTCHA with Cloudflare Turnstile <= 1.42.1 — Captcha Bypass

CVE-2026-66674Published · Updated

Action summary

Affected: ≤1.42.1Update to 1.42.3 or newer

All remediation steps
Watch plugin
Severity
Medium5.3
CVSS
5.3
CVSS 3.1 · CNA (Wordfence)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
What does this vector mean?
AV:N Attack vector
Network
AC:L Attack complexity
Low
PR:N Privileges required
None
UI:N User interaction
None
S:U Scope
Unchanged
C:N Confidentiality
None
I:L Integrity
Low
A:N Availability
None
Weakness
CWE-804 Guessable CAPTCHA
Required access
No account needed
Exploit prediction (EPSS)
0.3% chance in 30 days16th percentile
CISA KEV
Not listed
On this page8

Am I affected?

Simple CAPTCHA with Cloudflare Turnstile simple-cloudflare-turnstile

  1. Affected≤ 1.42.1
  2. Patched in1.42.3

Update to 1.42.3 or newer.

You are affected if you run ≤ 1.42.1. Version 1.42.3 and later are not affected by this issue.

  • Check your version: in wp-admin go to Plugins → Installed Plugins and read the version under Simple CAPTCHA with Cloudflare Turnstile.
  • No admin access? Run a passive check of your site. It reads public files only.
  • No account is needed to exploit this. Treat any exposed site on an affected version as at risk.

What to do

  1. Update to version 1.42.3, or a newer patched version
  2. Rotate administrator passwords and application secrets if the site ran a vulnerable version while publicly reachable.
  3. Watch Simple CAPTCHA with Cloudflare Turnstile to get an email when the next vulnerability is published.

Advisory

Source description from Wordfence Intelligence, credited to Ananda Dhakal.

The Simple CAPTCHA with Cloudflare Turnstile plugin for WordPress is vulnerable to Captcha Bypass in all versions up to, and including, 1.42.1. This makes it possible for unauthenticated attackers to bypass captcha.

Exploits & references

Proof-of-concept & detection

No public proof-of-concept or detection template is known for this vulnerability.

Advisories & patches

More in Simple CAPTCHA with Cloudflare Turnstile

All 10
More vulnerabilities in Simple CAPTCHA with Cloudflare Turnstile
SeverityVulnerabilityCVEPublished
Medium5.3Unauthenticated CAPTCHA Protection Bypass on Login
≤1.44.4Update to 1.44.5
CVE-2026-119498
Medium6.4Authenticated (Contributor+) Stored Cross-Site Scripting via Shortcode Attributes
≤1.44.3Update to 1.44.4
CVE-2026-93900
Medium5.3Unauthenticated CAPTCHA Protection Bypass
≤1.44.1Update to 1.44.2
CVE-2026-57775
Medium5.3Missing Authorization
≤1.44.0Update to 1.44.1
CVE-2026-39741
Medium6.5Unauthenticated Arbitrary Shortcode Execution
≤1.42.1Update to 1.42.3
CVE-2026-85116

Timeline

  1. CVE published

    Severity medium, CVSS 5.3

  2. Record last updated

Sources & licenses

Wordfence record
Vulnerability data
Wordfence Intelligence. Copyright 2012-2026 Defiant Inc. Licensed under the CC BY-SA 4.0.
CVE® identifiers
Copyright 1999-2026 The MITRE Corporation. Used under the CVE Program. CVE® is a registered trademark of The MITRE Corporation.
CVSS / CWE
National Vulnerability Database (NVD), shown unmodified. This product uses the NVD API but is not endorsed or certified by the NVD.
EPSS
Exploit Prediction Scoring System by FIRST.org.
VulnCrest content
Summary, remediation guidance and page layout © VulnCrest. Not sourced from NVD.

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