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CVE-2026-109447 — The User Profile Builder – Beautiful User Registration Forms, User Profiles & User Role…

Key facts

CVE-2026-109447 is a High (8.1) vulnerability: The User Profile Builder – Beautiful User Registration Forms, User Profiles & User Role…. This entry ships a detection-only PoC and a Docker test lab.
CVE CVE-2026-109447
Severity High (8.1)
Detection / prevention —
PoC poc.py
Source 2026/CVE-2026-109447/

Details

English | 한국어

Description

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.

Vulnerability Details

Property Value
CVE ID CVE-2026-109447
CVSS Score 8.1

Proof of Concept

Download

# Download PoC script
curl -O https://raw.githubusercontent.com/fankh/vulnerability-poc/main/2026/CVE-2026-109447/poc.py

Usage

# Run PoC against target
python3 poc.py --target <TARGET_URL>

# With authentication
python3 poc.py --target <TARGET_URL> --username <USER> --password <PASS>

⚠️ Warning: This PoC is for authorized security testing only. It uses detection-only techniques and does not exploit or damage target systems.

Test Lab

This repository includes a Docker-based test environment with both vulnerable and patched applications.

Quick Start

# Clone and navigate to CVE directory
cd CVE-2026-109447

# Start both applications
docker-compose up -d

# Run tests
./run-tests.sh    # Linux/Mac
./run-tests.ps1   # Windows PowerShell

Application Endpoints

Application URL Status
Vulnerable App http://localhost:8080 Shows vulnerability
Patched App http://localhost:8081 Demonstrates fix

Directory Structure

├── README.md           # English documentation
├── README_KO.md        # Korean documentation
├── poc.py              # PoC detection script
├── docker-compose.yml  # Container orchestration
├── run-tests.sh        # Linux/Mac test runner
├── run-tests.ps1       # Windows test runner
├── vulnerable-app/     # Vulnerable version
│   ├── app.py
│   ├── Dockerfile
│   └── requirements.txt
└── patched-app/        # Fixed version
    ├── app.py
    ├── Dockerfile
    └── requirements.txt

References

  • https://plugins.trac.wordpress.org/browser/profile-builder/tags/4.0.3/admin/admin-functions.php#L400
  • https://plugins.trac.wordpress.org/browser/profile-builder/tags/4.0.3/features/email-confirmation/email-confirmation.php#L262
  • https://plugins.trac.wordpress.org/browser/profile-builder/tags/4.0.3/front-end/class-formbuilder.php#L736
  • https://plugins.trac.wordpress.org/browser/profile-builder/tags/4.0.3/front-end/class-formbuilder.php#L793
  • https://plugins.trac.wordpress.org/browser/profile-builder/tags/4.0.3/front-end/register.php#L91
  • https://plugins.trac.wordpress.org/changeset/3741133/profile-builder
  • https://plugins.trac.wordpress.org/changeset/3741133/profile-builder/trunk/features/email-confirmation/email-confirmation.php
  • https://www.wordfence.com/threat-intel/vulnerabilities/id/88bfd754-e2ee-47c7-9af5-f31cbe993102?source=cve

Generated by PoC Generator on 2026-10-16T21:01:26.322913054

Frequently asked questions

What is CVE-2026-109447?

CVE-2026-109447 is a High (8.1) vulnerability: The User Profile Builder – Beautiful User Registration Forms, User Profiles & User Role…. This entry ships a detection-only PoC and a Docker test lab.

How do I detect CVE-2026-109447?

Run the detection-only PoC included with this entry against your Docker test lab to confirm whether a target is affected; pair it with your own IDS logging.

How do I block or mitigate CVE-2026-109447?

Upgrade to a fixed version per the vendor advisory; the NVD record lists the affected versions. Use the included PoC to verify your remediation.

For authorized security testing and research only. See the full source and NVD record.