Unauthenticated Bypass in Simple Cloudflare Turnstile

Executive Summary

CVE-2026-66674 is an unauthenticated bypass vulnerability in the Simple Cloudflare Turnstile WordPress plugin versions 1.42.1 and earlier. It allows attackers to bypass certain plugin restrictions without authentication, potentially enabling large-scale exploits across many websites.

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Detection Guidance

Detecting this vulnerability requires checking the version of the Simple Cloudflare Turnstile plugin. If your version is 1.42.1 or earlier, the system is vulnerable. Use commands like 'wp plugin list' in WordPress or inspect the plugin files directly to verify the version.

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Impact Analysis

This vulnerability could allow attackers to bypass security measures implemented by the plugin, potentially enabling spam submissions, brute force attacks, or other malicious activities on websites using vulnerable versions. Attackers may exploit it without needing user credentials.

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Compliance Impact

The vulnerability allows unauthenticated bypass of security restrictions, which could lead to unauthorized access or manipulation of protected data. This may violate compliance requirements under GDPR (data protection) and HIPAA (healthcare data privacy) by exposing sensitive information or failing to enforce proper access controls.

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Mitigation Strategies

Immediately update the Simple Cloudflare Turnstile plugin to version 1.42.3 or later. If updating is not possible, apply the mitigation rule provided by Patchstack to block attacks until the update is completed.

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