# Pie Register <= 3.8.4.18 - Unauthenticated reCAPTCHA Bypass via Registration Form

- **ID:** WPSEC-2026-3028
- **Plugin:** Pie Register – User Registration, Profiles & Content Restriction (`pie-register`), https://wordpress.org/plugins/pie-register/
- **Affected versions:** all versions before 4.0.0.0
- **Fixed in:** 4.0.0.0 (Update to 4.0.0.0 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-693
- **Usage among sites WPSec scans:** plugin Low, affected versions Low (as of 2026-11-13)
- **Attack surface analysis:** https://attacksurface.wpsec.com/plugin/pie-register
- **Fix released:** 2026-11-12
- **Published:** 2026-11-13
- **URL:** https://wpsec.com/vuln/WPSEC-2026-3028/

## Description

The Pie Register – User Registration, Profiles & Content Restriction plugin for WordPress is vulnerable to a CAPTCHA bypass via the registration form's reCAPTCHA field in all versions up to, and including, 3.8.4.18, due to the server-side reCAPTCHA check on registration only running when the 'piereg_enable_recaptcha' setting is enabled, a setting the plugin never creates or saves. This makes it possible for unauthenticated attackers to submit the registration form without solving the reCAPTCHA shown on it and create accounts automatically, bypassing the bot protection the site owner configured.

## References

- https://wpsec.com/vuln/WPSEC-2026-3028/
- https://plugins.svn.wordpress.org/pie-register/tags/4.0.0.0/
- https://wordpress.org/plugins/pie-register/

Source: WPSec, https://wpsec.com/vuln/WPSEC-2026-3028/

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.