# Pie Register <= 3.8.4.15 - Unauthenticated Missing Authorization to Plugin Settings Reset

- **ID:** WPSEC-2026-2121
- **Plugin:** Pie Register – User Registration, Profiles & Content Restriction (`pie-register`), https://wordpress.org/plugins/pie-register/
- **Affected versions:** all versions before 3.8.4.16
- **Fixed in:** 3.8.4.16 (Update to 3.8.4.16 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-862
- **Usage among sites WPSec scans:** plugin Low, affected versions Low (as of 2026-10-30)
- **Attack surface analysis:** https://attacksurface.wpsec.com/plugin/pie-register
- **Fix released:** 2026-10-29
- **Published:** 2026-10-30
- **URL:** https://wpsec.com/vuln/WPSEC-2026-2121/

## Description

The pie-register plugin for WordPress is vulnerable to unauthorized modification of data in all versions up to, and including, 3.8.4.15 due to a missing capability and nonce check on the settings reset routine, which ran whenever the 'piereg_default_settings' POST parameter was present. This makes it possible for unauthenticated attackers to reset all of the plugin's settings to their defaults, wiping the site's registration configuration.

## References

- https://wpsec.com/vuln/WPSEC-2026-2121/
- https://plugins.svn.wordpress.org/pie-register/tags/3.8.4.16/
- https://wordpress.org/plugins/pie-register/

Source: WPSec, https://wpsec.com/vuln/WPSEC-2026-2121/

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.