---
id: CVE-2026-100186
title: >-
  User Profile Builder <= 4.0.3 - Unauthenticated Stored Cross-Site Scripting
  via First Name Field
summary: >-
  The User Profile Builder – Beautiful User Registration Forms, User Profiles &
  User Role Editor plugin for WordPress is vulnerable to Stored Cross-Site
  Scripting via First Name Field in all versions up to, and including, 4.0.3 due
  to insu…
severity: high
cvss: 7.2
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N'
cvssSource: cna
cwe:
  - CWE-79
vendor: cozmoslabs
product: >-
  User Profile Builder – Beautiful User Registration Forms, User Profiles & User
  Role Editor
affected:
  - >-
    user_profile_builder_beautiful_user_registration_forms_user_profiles_user_role_editor
    <= 4.0.3
published: '2026-10-16'
updated: '2026-10-16'
sourceUpdated: '2026-10-16T05:30:28.153Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-100186'
references:
  - url: >-
      https://www.wordfence.com/threat-intel/vulnerabilities/id/f3f2ecdb-bbd0-4834-b731-88724ca0dfd7?source=cve
  - url: >-
      https://plugins.trac.wordpress.org/browser/profile-builder/tags/4.0.3/features/email-confirmation/class-email-confirmation.php#L99
  - url: >-
      https://plugins.trac.wordpress.org/browser/profile-builder/tags/4.0.3/features/email-confirmation/class-email-confirmation.php#L100
  - url: >-
      https://plugins.trac.wordpress.org/browser/profile-builder/tags/4.0.3/front-end/default-fields/first-name/first-name.php#L56
  - url: >-
      https://plugins.trac.wordpress.org/browser/profile-builder/tags/4.0.3/features/email-confirmation/email-confirmation.php#L470
  - url: 'https://plugins.trac.wordpress.org/changeset/3741133/profile-builder'
  - url: >-
      https://plugins.trac.wordpress.org/changeset/3741133/profile-builder/trunk/features/email-confirmation/class-email-confirmation.php
tags:
  - cve.org
ingestedAt: '2026-10-16T06:00:00.386Z'
---

## Overview

The User Profile Builder – Beautiful User Registration Forms, User Profiles & User Role Editor plugin for WordPress is vulnerable to Stored Cross-Site Scripting via First Name Field in all versions up to, and including, 4.0.3 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. This vulnerability is only exploitable when the Email Confirmation feature is enabled in Profile Builder.

## Affected

- `user_profile_builder_beautiful_user_registration_forms_user_profiles_user_role_editor <= 4.0.3`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.