# Kitgenix CAPTCHA for Cloudflare Turnstile <= 2.1.4 - Unauthenticated CAPTCHA Bypass via Non-Canonical Login URL

- **ID:** WPSEC-2026-2265
- **Plugin:** Kitgenix CAPTCHA for Cloudflare Turnstile (`kitgenix-captcha-for-cloudflare-turnstile`), https://wordpress.org/plugins/kitgenix-captcha-for-cloudflare-turnstile/
- **Affected versions:** from 1.1.0 before 2.2.0
- **Fixed in:** 2.2.0 (Update to 2.2.0 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-647
- **Usage among sites WPSec scans:** plugin Low, affected versions Low (as of 2026-11-03)
- **Attack surface analysis:** https://attacksurface.wpsec.com/plugin/kitgenix-captcha-for-cloudflare-turnstile
- **Fix released:** 2026-10-30
- **Published:** 2026-11-03
- **URL:** https://wpsec.com/vuln/WPSEC-2026-2265/

## Description

The Kitgenix CAPTCHA for Cloudflare Turnstile plugin for WordPress is vulnerable to a CAPTCHA Bypass via the WordPress login form in all versions from 1.1.0 up to, and including, 2.1.4. This is due to the login check deciding whether a request is a wp-login.php login by comparing the raw REQUEST_URI path with the path of wp_login_url(), and skipping Turnstile verification when the two differ and no Turnstile fields are posted. Web servers still run wp-login.php for non-canonical forms of the path such as '//wp-login.php', '/./wp-login.php' or '/wp%2Dlogin.php', but those forms do not match the comparison. This makes it possible for unauthenticated attackers to submit login attempts without solving the Turnstile challenge, so they can run automated brute-force and credential-stuffing attacks that the CAPTCHA is meant to block.

## References

- https://wpsec.com/vuln/WPSEC-2026-2265/
- https://plugins.svn.wordpress.org/kitgenix-captcha-for-cloudflare-turnstile/tags/2.2.0/
- https://wordpress.org/plugins/kitgenix-captcha-for-cloudflare-turnstile/

Source: WPSec, https://wpsec.com/vuln/WPSEC-2026-2265/

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.