CVE-2026-19660 — The Divi Membership plugin for WordPress is vulnerable to Authentication Bypass in all…¶

Key facts

CVE-2026-19660 is a Critical (9.8) vulnerability: The Divi Membership plugin for WordPress is vulnerable to Authentication Bypass in all…. This entry ships a detection-only PoC and a Docker test lab.


CVE	CVE-2026-19660
Severity	Critical (9.8)
Detection / prevention	—
PoC	poc.py
Source	2026/CVE-2026-19660/

Details¶

English | 한국어

Description¶

The Divi Membership plugin for WordPress is vulnerable to Authentication Bypass in all versions up to, and including, 2.3.0. The process_paypal_callback function, hooked to the init action, accepts a base64-encoded paypal_param GET parameter with no IPN validation, no cryptographic signature check, no ownership verification, and no nonce, allowing it to trust an entirely attacker-controlled user ID value that is passed directly to wp_set_current_user() and wp_set_auth_cookie(). This makes it possible for unauthenticated attackers to log in as any existing WordPress user — including administrators — by supplying an arbitrary user ID in the paypal_param GET parameter, resulting in full site takeover. The vulnerability is further compounded by the fact that the PayPal gateway class is instantiated unconditionally regardless of whether PayPal is enabled or configured, ensuring the vulnerable hook is always registered on every front-end request.

Vulnerability Details¶

Property	Value
CVE ID	CVE-2026-19660
CVSS Score	9.8

Proof of Concept¶

Download¶

# Download PoC script
curl -O https://raw.githubusercontent.com/fankh/vulnerability-poc/main/2026/CVE-2026-19660/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-2026-19660

# 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://diviengine.com/divi-membership-changelog/
https://www.wordfence.com/threat-intel/vulnerabilities/id/3d650cda-341f-4772-9b67-1bac200e3fb7?source=cve

Generated by PoC Generator on 2026-10-03T17:02:20.913325521

Frequently asked questions¶

What is CVE-2026-19660?¶

CVE-2026-19660 is a Critical (9.8) vulnerability: The Divi Membership plugin for WordPress is vulnerable to Authentication Bypass in all…. This entry ships a detection-only PoC and a Docker test lab.

How do I detect CVE-2026-19660?¶

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-2026-19660?¶

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.