# User Profile Builder – Beautiful User Registration Forms, User Profiles & User Role Editor <= 4.0.5 - Authenticated (Author+) Privilege Escalation via Register Form in Query Loop and Block-Rendered Content

- **ID:** WPSEC-2026-2007
- **Plugin:** User Profile Builder – Beautiful User Registration Forms, User Profiles & User Role Editor (`profile-builder`), https://wordpress.org/plugins/profile-builder/
- **Affected versions:** all versions before 4.0.6
- **Fixed in:** 4.0.6 (Update to 4.0.6 or later.)
- **Severity:** High 8.8 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)
- **Weakness:** CWE-863
- **Usage among sites WPSec scans:** plugin Medium, affected versions Medium (as of 2026-10-30)
- **Attack surface analysis:** https://attacksurface.wpsec.com/plugin/profile-builder
- **Fix released:** 2026-10-29
- **Published:** 2026-10-30
- **URL:** https://wpsec.com/vuln/WPSEC-2026-2007/

## Description

The User Profile Builder plugin for WordPress is vulnerable to Privilege Escalation via the Register form and the [wppb-register] shortcode in all versions up to, and including, 4.0.5, due to wppb_front_end_register() checking only the post returned by get_the_ID() when deciding whether a post author may publish a registration form and which role it may assign. A Register block placed inside a Query Loop is checked against the author of the looped post. Register shortcode text in excerpts, titles or embeds rendered by blocks is expanded by the outer page's do_shortcode() and checked against that page's author. This makes it possible for authenticated attackers with author-level access and above to publish a registration form that assigns a role they cannot grant, such as administrator, and then register an administrator account.

## References

- https://wpsec.com/vuln/WPSEC-2026-2007/
- https://plugins.svn.wordpress.org/profile-builder/tags/4.0.6/
- https://wordpress.org/plugins/profile-builder/

Source: WPSec, https://wpsec.com/vuln/WPSEC-2026-2007/

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.