CVE-2026-66674Network attack vector

Unauthenticated CAPTCHA bypass

Published Sep 10, 2026 · Updated Sep 10, 2026

Authentication bypass in RelyWP Simple CAPTCHA with Cloudflare Turnstile 1.42.1 and earlier allows remote attackers to evade CAPTCHA checks. Patchstack has not published the affected function or request manipulation; the upstream 1.42.3 changelog lists several distinct bypass fixes without tying this CVE to one. No account or user interaction is required, but reachability depends on Turnstile being enabled for an affected WordPress or WooCommerce form, and the resulting action is limited to what that form permits.

CVSS severity5.6
Medium
EPSS probability0.20%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in RelyWP Simple CAPTCHA with Cloudflare Turnstile 1.42.1 and earlier allows remote attackers to evade CAPTCHA checks. Patchstack has not published the affected function or request manipulation; the upstream 1.42.3 changelog lists several distinct bypass fixes without tying this CVE to one. No account or user interaction is required, but reachability depends on Turnstile being enabled for an affected WordPress or WooCommerce form, and the resulting action is limited to what that form permits.

The record

CVE
CVE-2026-66674
Published
Sep 10, 2026
Updated
Sep 10, 2026
Vendor
RelyWP
Product
Simple CAPTCHA with Cloudflare Turnstile
Classifications
CWE-290, CAPEC-151, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 10, 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=n/a <=1.42.1 changes=[{"at":"1.42.3","status":"unaffected"}]

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

RelyWP · Simple CAPTCHA with Cloudflare Turnstileversion=n/a <=1.42.1 changes=[{"at":"1.42.3","status":"unaffected"}]

Published CVSS scores

5.6PatchstackCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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 exploitUnconfirmed

Weakness, pattern, technique

CWE-290Authentication Bypass by Spoofing
CAPEC-151Identity Spoofing
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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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