# WP User Manager – Registration Form, Login Form, User Profile Builder & Member Directory <= 2.10.0 - Unauthenticated Protection Mechanism Bypass via Login Form Field Names

- **ID:** WPSEC-2026-1815
- **Plugin:** WP User Manager – Registration Form, Login Form, User Profile Builder & Member Directory (`wp-user-manager`), https://wordpress.org/plugins/wp-user-manager/
- **Affected versions:** all versions before 2.10.1
- **Fixed in:** 2.10.1 (Update to 2.10.1 or later.)
- **Severity:** Medium 5.3 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N)
- **Weakness:** CWE-288
- **Usage among sites WPSec scans:** plugin Low, affected versions Low (as of 2026-10-28)
- **Attack surface analysis:** https://attacksurface.wpsec.com/plugin/wp-user-manager
- **Fix released:** 2026-10-27
- **Published:** 2026-10-28
- **URL:** https://wpsec.com/vuln/WPSEC-2026-1815/

## Description

The WP User Manager plugin for WordPress is vulnerable to a protection mechanism bypass of the "Prevent site access to visitors" feature in all versions up to, and including, 2.10.0. This is due to the site-lock check skipping enforcement whenever a request contains the 'wp-submit' and 'log' POST parameters, regardless of the requested URL. This makes it possible for unauthenticated attackers to view pages and content that the site owner restricted to logged-in users by POSTing those login form field names to them, on sites where the site access restriction is enabled.

## References

- https://wpsec.com/vuln/WPSEC-2026-1815/
- https://plugins.svn.wordpress.org/wp-user-manager/tags/2.10.1/
- https://wordpress.org/plugins/wp-user-manager/

Source: WPSec, https://wpsec.com/vuln/WPSEC-2026-1815/

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.