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CVE-2026-66674— WordPress Simple Cloudflare Turnstile plugin <= 1.42.1 - Captcha Bypass vulnerability

Quick assessment

Affected
Elliot Sowers/ RelyWP Simple Cloudflare Turnstile
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

WordPress Simple CAPTCHA with Cloudflare Turnstile是WordPress基金会开源的一款集成Cloudflare Turnstile验证的简单验证码插件。 WordPress Simple CAPTCHA with Cloudflare Turnstile 1.42.1及之前版本存在授权问题漏洞，该漏洞源于身份验证绕过，可能导致未经身份验证的攻击者绕过身份验证机制。

CVSS 5.6 · Medium EPSS 0.25% · P17

Possible ATT&CK Techniques 1 AI

T1568 · Dynamic Resolution

Affected Version Matrix 1

VendorProduct Version RangeStatus
Elliot Sowers/ RelyWP Simple Cloudflare Turnstile n/a≤ 1.42.1 affected
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I. Basic Information for CVE-2026-66674

Vulnerability Information
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Vulnerability Title
WordPress Simple Cloudflare Turnstile plugin <= 1.42.1 - Captcha Bypass vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
Unauthenticated Bypass Vulnerability in Simple Cloudflare Turnstile <= 1.42.1 versions.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
使用欺骗进行的认证绕过
Source: CVE Program / CVE List V5
Vulnerability Title
WordPress Simple CAPTCHA with Cloudflare Turnstile 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
WordPress Simple CAPTCHA with Cloudflare Turnstile是WordPress基金会开源的一款集成Cloudflare Turnstile验证的简单验证码插件。 WordPress Simple CAPTCHA with Cloudflare Turnstile 1.42.1及之前版本存在授权问题漏洞，该漏洞源于身份验证绕过，可能导致未经身份验证的攻击者绕过身份验证机制。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Elliot Sowers/ RelyWP Simple Cloudflare Turnstile n/a ~ 1.42.1 -

II. Public POCs for CVE-2026-66674

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III. Intelligence Information for CVE-2026-66674

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News Coverage for CVE-2026-66674 (1)

IV. Related Vulnerabilities

Same product: Simple Cloudflare Turnstile
Same vendor: Elliot Sowers/ RelyWP
Same weakness: CWE-290