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CVE-2026-9273 — The Membership Plugin – Kadence Memberships plugin for WordPress (formerly Restrict…

Key facts

CVE-2026-9273 is a Critical (9.3) vulnerability: The Membership Plugin – Kadence Memberships plugin for WordPress (formerly Restrict…. This entry ships a detection-only PoC and a Docker test lab.
CVE CVE-2026-9273
Severity Critical (9.3)
Detection / prevention —
PoC poc.py
Source 2026/CVE-2026-9273/

Details

English | 한국어

Description

The Membership Plugin – Kadence Memberships plugin for WordPress (formerly Restrict Content) is vulnerable to password reset link poisoning leading to account takeover in all versions up to, and including, 4.0.0. This is due to the legacy lost-password handler rc_process_lost_password_form() consuming the attacker-controlled rc_redirect POST parameter into two unvalidated sinks in legacy/includes/forms.php: wp_redirect( esc_url( $_POST['rc_redirect'] ) . ... ) at line 243, and add_query_arg( array( 'key' => $key, 'login' => ... ), $_POST['rc_redirect'] ) inside rc_send_password_reset_email() at line 306. The nonce required to reach the handler is broadcast by the public [login_form] shortcode at line 207 to any anonymous visitor. This makes it possible for unauthenticated attackers to issue a password-reset request for any account (including administrators) whose reset email body points the victim at an attacker-controlled host carrying a valid reset key/login. When the victim clicks the link, the reset key leaks to the attacker, who can replay it against the legitimate site to complete account takeover.

Vulnerability Details

Property Value
CVE ID CVE-2026-9273
CVSS Score 9.3

Proof of Concept

Download

# Download PoC script
curl -O https://raw.githubusercontent.com/fankh/vulnerability-poc/main/2026/CVE-2026-9273/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-2026-9273

# 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/restrict-content/tags/4.0.0/legacy/includes/forms.php#L207
  • https://plugins.trac.wordpress.org/browser/restrict-content/tags/4.0.0/legacy/includes/forms.php#L243
  • https://plugins.trac.wordpress.org/browser/restrict-content/tags/4.0.0/legacy/includes/forms.php#L306
  • https://plugins.trac.wordpress.org/browser/restrict-content/trunk/legacy/includes/forms.php#L243
  • https://plugins.trac.wordpress.org/browser/restrict-content/trunk/legacy/includes/forms.php#L306
  • https://plugins.trac.wordpress.org/changeset?new=3549742%40restrict-content%2Ftags%2F4.0.1&old=3529319%40restrict-content%2Ftags%2F4.0.0
  • https://www.wordfence.com/threat-intel/vulnerabilities/id/ca38c423-2df8-4f20-bd95-2ecd84167a7f?source=cve

Generated by PoC Generator on 2026-08-10T06:52:14.48523356

Frequently asked questions

What is CVE-2026-9273?

CVE-2026-9273 is a Critical (9.3) vulnerability: The Membership Plugin – Kadence Memberships plugin for WordPress (formerly Restrict…. This entry ships a detection-only PoC and a Docker test lab.

How do I detect CVE-2026-9273?

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-2026-9273?

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.