User Profile Builder <= 4.0.4 - Authenticated (Subscriber+) CAPTCHA Bypass via REST API and XML-RPC Comments

ID

WPSEC-2026-1353

Plugin

User Profile Builder – Beautiful User Registration Forms, User Profiles & User Role Editor (profile-builder)

Affected

all versions before 4.0.5

Remediation

Update to 4.0.5 or later.

CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

Weakness

CWE-693

Usage

Plugin Medium · Affected versions Medium among sites WPSec scans, 2026-10-21

Attack surface

User Profile Builder on WPSec AttackSurface

Fix released

2026-10-19

Published

2026-10-21

Description

The User Profile Builder plugin for WordPress is vulnerable to a CAPTCHA bypass on the default WordPress comments form in all versions up to, and including, 4.0.4. This is due to the reCAPTCHA and Turnstile checks in wppb_verify_recaptcha_default_wp_comments() and wppb_verify_turnstile_default_wp_comments() running only when the HTML comment form is submitted. When CAPTCHA protection for comments is enabled, this makes it possible for authenticated attackers with Subscriber-level access and above to post comments through the REST API or XML-RPC without solving the CAPTCHA. Unauthenticated attackers can do the same on sites that allow anonymous API comments.

References

• https://wpsec.com/vuln/WPSEC-2026-1353/
• https://plugins.svn.wordpress.org/profile-builder/tags/4.0.5/
• https://wordpress.org/plugins/profile-builder/

Published by WPSec. Provided as is, without warranty. Corrections: contact us.

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