# Simple CAPTCHA with Cloudflare Turnstile <= 1.44.0 - Unauthenticated CAPTCHA Bypass via Contact Form 7 Turnstile Form-Tag

- **ID:** WPSEC-2026-1908
- **Plugin:** Simple CAPTCHA with Cloudflare Turnstile (`simple-cloudflare-turnstile`), https://wordpress.org/plugins/simple-cloudflare-turnstile/
- **Affected versions:** all versions before 1.44.1
- **Fixed in:** 1.44.1 (Update to 1.44.1 or later.)
- **Severity:** Medium 5.3 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N)
- **Weakness:** CWE-807
- **Usage among sites WPSec scans:** plugin Medium, affected versions Medium (as of 2026-10-29)
- **Attack surface analysis:** https://attacksurface.wpsec.com/plugin/simple-cloudflare-turnstile
- **Fix released:** 2026-10-28
- **Published:** 2026-10-29
- **URL:** https://wpsec.com/vuln/WPSEC-2026-1908/

## Description

The Simple CAPTCHA with Cloudflare Turnstile plugin for WordPress is vulnerable to CAPTCHA Bypass via the Contact Form 7 Turnstile form-tag integration in all versions up to, and including, 1.44.0. This is due to the plugin deciding whether a submitted form uses the Turnstile form-tag from the user-supplied '_wpcf7' POST field, instead of from the form Contact Form 7 is actually processing. This makes it possible for unauthenticated attackers to submit Contact Form 7 forms protected with the form-tag without solving Turnstile, by leaving out that field or pointing it at another form. Sites using the 'Enable on all CF7 Forms' option are not affected.

## References

- https://wpsec.com/vuln/WPSEC-2026-1908/
- https://plugins.svn.wordpress.org/simple-cloudflare-turnstile/tags/1.44.1/
- https://wordpress.org/plugins/simple-cloudflare-turnstile/

Source: WPSec, https://wpsec.com/vuln/WPSEC-2026-1908/

License: CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Free to use, share and adapt, also commercially, if you credit WPSec and link to this advisory.