CVE-2026-109447 json
User Profile Builder <= 4.0.3 - Unauthenticated Privilege Escalation to 'role' Parameter via Legacy Meta-Name Collision on [wppb-register]
published 2026-10-16 24 d ago modified 2026-10-16 24 d ago also EUVD-2026-102672
- cvss
- 8.1
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.3%
- EPSS 0.3% chance of exploitation in 30 days, percentile 27%
- public exploits
- 0
- none known
Summary
The User Profile Builder – Beautiful User Registration Forms, User Profiles & User Role Editor plugin for WordPress is vulnerable to Privilege Escalation in all versions up to, and including, 4.0.3 via the `role` parameter handled by the `wppb_add_meta_to_user_on_activation()` function. The vulnerability exists because the activation handler passes the attacker-supplied role value directly to `WP_User::set_role()` with no allow-list validation, and the 4.0.3 reserved-name check exempts pre-existing form fields from the block, allowing a legacy field with meta-name `role` to persist and bridge attacker-controlled request input into the serialized signup record stored in `wp_signups`. This makes it possible for unauthenticated attackers to gain a fully activated WordPress administrator account by submitting `role=administrator` through the public `[wppb-register]` shortcode form and subsequently clicking the confirmation activation link. Exploitation requires the site to have a legacy form field with meta-name `role` carried over from before the 4.0.3 upgrade, email confirmation enabled, and open user registration — all stable site-state conditions once established.
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- total
- Assessed
- 24 d ago
Exploit prediction
0.34% chance of exploitation in the next 30 days, higher than 27% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 8.1 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H |
Affected products
- cozmoslabs User Profile Builder – Beautiful User Registration Forms, User Profiles & User Role Editor
Classification
- Weakness
-
- CWE-269 Improper Privilege Management
- Technology feeds
References
- wordfence.com /threat-intel/vulnerabilities/id/88bfd754-e2ee-47c7-9af5-f31cbe993102?source=cve
- plugins.trac.wordpress.org /browser/profile-builder/tags/4.0.3/features/email-confirmation/email-confirmation.php#L262
- plugins.trac.wordpress.org /browser/profile-builder/tags/4.0.3/front-end/class-formbuilder.php#L793
- plugins.trac.wordpress.org /browser/profile-builder/tags/4.0.3/front-end/class-formbuilder.php#L736
- plugins.trac.wordpress.org /browser/profile-builder/tags/4.0.3/front-end/register.php#L91
- plugins.trac.wordpress.org /browser/profile-builder/tags/4.0.3/admin/admin-functions.php#L400
- plugins.trac.wordpress.org /changeset/3741133/profile-builder
- plugins.trac.wordpress.org /changeset/3741133/profile-builder/trunk/features/email-confirmation/email-confirmation.php
Sources
- CVE List CVE-2026-109447
- NVD CVE-2026-109447
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.