Vulnerability in User Profile Builder – Beautiful User Registration Forms, User Profiles & User Role Editor — CVE-2026-100186

What to do now

Update User Profile Builder – Beautiful User Registration Forms, User Profiles & User Role Editor to 4.0.4 or later.

Affected versions

• Everything up to and including 4.0.3

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.

This description is reproduced verbatim from the public vulnerability record.

• https://plugins.trac.wordpress.org/browser/profile-builder/tags/4.0.3/features/email-confirmation/class-email-confirmation.php#L100
• https://plugins.trac.wordpress.org/browser/profile-builder/tags/4.0.3/features/email-confirmation/class-email-confirmation.php#L99
• https://plugins.trac.wordpress.org/browser/profile-builder/tags/4.0.3/features/email-confirmation/email-confirmation.php#L470
• https://plugins.trac.wordpress.org/browser/profile-builder/tags/4.0.3/front-end/default-fields/first-name/first-name.php#L56
• https://plugins.trac.wordpress.org/changeset/3741133/profile-builder
• https://plugins.trac.wordpress.org/changeset/3741133/profile-builder/trunk/features/email-confirmation/class-email-confirmation.php

This page is compiled automatically from public databases. Accuracy is not guaranteed; confirm against the vendor advisory before acting.