# CVE-2026-66674: WordPress Simple Cloudflare Turnstile auth bypass

Source: https://junglewise.ai/threats/cve-2026-66674-wordpress-simple-cloudflare-turnstile-auth-bypass  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-10. Updated: 2026-09-26  
License: CC BY 4.0 with a link back

CVE-2026-66674 · Severity: medium · CVSS 5.6 · Published 2026-09-10

Simple Cloudflare Turnstile is a WordPress plugin that provides bot protection for web forms using Cloudflare's CAPTCHA service. The plugin in versions 1.42.1 and earlier contains a vulnerability that allows attackers to bypass security verification checks without authentication, potentially enabling automated attacks or spam submissions on affected websites.

Technologies: [RelyWP Simple Cloudflare Turnstile](https://junglewise.ai/threats/technologies/simple-cloudflare-turnstile). Vendors: [RelyWP](https://junglewise.ai/threats/vendors/relywp).

## Quick answers

**Is CVE-2026-66674 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-66674 being exploited in the wild.

**How severe is CVE-2026-66674?** Medium severity, with a CVSS score of 5.6, published 10 September 2026.

**Which products and versions are affected?** RelyWP Simple Cloudflare Turnstile <=1.42.1.

**Is there a fix for CVE-2026-66674?** A patch was published on 2026-09-10: Fix released in version 1.42.3 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-66674 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-66674?** Check whether you run RelyWP Simple Cloudflare Turnstile at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The vulnerability is classified as an authentication bypass or insecure design flaw in the Simple Cloudflare Turnstile WordPress plugin (versions ≤ 1.42.1). The plugin fails to properly validate or enforce security checks, allowing unauthenticated attackers to circumvent the Cloudflare Turnstile CAPTCHA protection. This is a network-accessible vulnerability requiring no authentication, making it trivial to exploit. Attackers can bypass bot protection mechanisms, potentially automating form submissions, account creation, or other protected actions on vulnerable WordPress installations. The vulnerability was patched in version 1.42.3, and affected users should update immediately.

## Affected products

- RelyWP Simple Cloudflare Turnstile <=1.42.1

## Timeline

- 2026-09-08: disclosed: Vulnerability published by Patchstack
- 2026-09-10: patched: Fix released in version 1.42.3

## References

- [https://wordpress.org/plugins](https://wordpress.org/plugins)
- [https://patchstack.com/database/wordpress/plugin/simple-cloudflare-turnstile/vulnerability/wordpress-simple-cloudflare-turnstile-plugin-1-42-1-captcha-bypass-vulnerability?_s_id=cve](https://patchstack.com/database/wordpress/plugin/simple-cloudflare-turnstile/vulnerability/wordpress-simple-cloudflare-turnstile-plugin-1-42-1-captcha-bypass-vulnerability?_s_id=cve)

## Related threats

- [RelyWP Simple Cloudflare Turnstile authentication bypass](https://junglewise.ai/threats/cve-2026-119498-authentication-bypass-using-an-alternate-path-or-channel)
- [RelyWP Simple Cloudflare Turnstile authentication bypass](https://junglewise.ai/threats/cve-2026-57775-authentication-bypass-using-an-alternate-path-or-channel)
- [RelyWP Simple Cloudflare Turnstile broken access control](https://junglewise.ai/threats/cve-2026-39741-missing-authorization-vulnerability-in-relywp-simple-cloudflare)
- [Simple Cloudflare Turnstile content injection](https://junglewise.ai/threats/cve-2026-66632-simple-cloudflare-turnstile-content-injection)
- [RelyWP Simple Cloudflare Turnstile broken authentication](https://junglewise.ai/threats/cve-2026-40799-relywp-simple-cloudflare-turnstile-broken-authentication)