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CVE-2026-109221 — The Groundhogg — CRM, Newsletters, and Marketing Automation plugin for WordPress is…

Key facts

CVE-2026-109221 is a High (8.1) vulnerability: The Groundhogg — CRM, Newsletters, and Marketing Automation plugin for WordPress is…. This entry ships a detection-only PoC and a Docker test lab.
CVE CVE-2026-109221
Severity High (8.1)
Detection / prevention —
PoC poc.py
Source 2026/CVE-2026-109221/

Details

English | 한국어

Description

The Groundhogg — CRM, Newsletters, and Marketing Automation plugin for WordPress is vulnerable to arbitrary file deletion due to insufficient file path validation in the copy_file function in all versions up to, and including, 4.9.3 This makes it possible for authenticated attackers, with Sales Representative-level access and above, to delete arbitrary files on the server, which can easily lead to remote code execution when the right file is deleted (such as wp-config.php). This is exploitable by any user holding the plugin-defined import_contacts capability, which is granted by default to the plugin's custom Sales Representative role.

Vulnerability Details

Property Value
CVE ID CVE-2026-109221
Type RCE
CVSS Score 8.1

Proof of Concept

Download

# Download PoC script
curl -O https://raw.githubusercontent.com/fankh/vulnerability-poc/main/2026/CVE-2026-109221/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-2026-109221

# 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://github.com/groundhoggwp/groundhogg/commit/e319e4a849bfbb07cccfbac8558ad6bf07a7fdc0
  • https://plugins.trac.wordpress.org/browser/groundhogg/tags/4.9.3/admin/tools/tools-page.php#L575
  • https://plugins.trac.wordpress.org/browser/groundhogg/tags/4.9.3/admin/tools/tools-page.php#L602
  • https://plugins.trac.wordpress.org/browser/groundhogg/tags/4.9.3/includes/background/import-contacts.php#L200
  • https://plugins.trac.wordpress.org/browser/groundhogg/tags/4.9.3/includes/classes/traits/file-box.php#L85
  • https://plugins.trac.wordpress.org/browser/groundhogg/tags/4.9.3/includes/classes/traits/file-box.php#L94
  • https://plugins.trac.wordpress.org/browser/groundhogg/tags/4.9.3/includes/functions.php#L2872
  • https://plugins.trac.wordpress.org/browser/groundhogg/tags/4.9.3/includes/functions.php#L8045
  • https://plugins.trac.wordpress.org/browser/groundhogg/tags/4.9.3/includes/main-roles.php#L583
  • https://plugins.trac.wordpress.org/browser/groundhogg/tags/4.9.3/includes/utils/files.php#L323
  • https://plugins.trac.wordpress.org/changeset/3744461/groundhogg/trunk/includes/classes/traits/file-box.php
  • https://www.wordfence.com/threat-intel/vulnerabilities/id/fb5100ac-cfe6-4e91-9349-6e8efa850147?source=cve

Generated by PoC Generator on 2026-10-16T21:47:46.086166081

Frequently asked questions

What is CVE-2026-109221?

CVE-2026-109221 is a High (8.1) vulnerability: The Groundhogg — CRM, Newsletters, and Marketing Automation plugin for WordPress is…. This entry ships a detection-only PoC and a Docker test lab.

How do I detect CVE-2026-109221?

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-2026-109221?

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.