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CVE-2026-15964 — The Single Sign On For TNG plugin for WordPress is vulnerable to Authentication Bypass…

Key facts

CVE-2026-15964 is a Critical (9.8) vulnerability: The Single Sign On For TNG plugin for WordPress is vulnerable to Authentication Bypass…. This entry ships a detection-only PoC and a Docker test lab.
CVE CVE-2026-15964
Severity Critical (9.8)
Detection / prevention —
PoC poc.py
Source 2026/CVE-2026-15964/

Details

English | 한국어

Description

The Single Sign On For TNG plugin for WordPress is vulnerable to Authentication Bypass via unauthenticated password reset in all versions up to, and including, 2.0.0. This is due to the ssoprocess_ajax() function — registered on wp_ajax_nopriv_ssoprocess_ajax and therefore reachable without authentication — accepting an attacker-supplied email parameter with the setnewpassword operation and calling reset_password() on the resolved account without any ownership token, email confirmation link, or capability check. The sole guard is a call to check_ajax_referer(), which provides no authorization barrier because the ssoajaxnonce nonce is publicly broadcast on every front-end page via wp_localize_script() into the SSOPWDREQUIREMENT JavaScript object; since WordPress computes nonces for logged-out visitors against a shared anonymous session context, any unauthenticated visitor can scrape a valid nonce from the homepage and use it to authenticate the request. This makes it possible for unauthenticated attackers to change the password of any WordPress account, including administrator accounts, enabling complete site takeover.

Vulnerability Details

Property Value
CVE ID CVE-2026-15964
CVSS Score 9.8

Proof of Concept

Download

# Download PoC script
curl -O https://raw.githubusercontent.com/fankh/vulnerability-poc/main/2026/CVE-2026-15964/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-2026-15964

# 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/single-sign-on-for-tng/tags/2.0.0/single-sign-on-for-tng.php#L102
  • https://plugins.trac.wordpress.org/browser/single-sign-on-for-tng/tags/2.0.0/single-sign-on-for-tng.php#L120
  • https://plugins.trac.wordpress.org/browser/single-sign-on-for-tng/tags/2.0.0/single-sign-on-for-tng.php#L69
  • https://plugins.trac.wordpress.org/browser/single-sign-on-for-tng/tags/2.0.0/single-sign-on-for-tng.php#L96
  • https://plugins.trac.wordpress.org/changeset?reponame=&old=3624827%40single-sign-on-for-tng&new=3624827%40single-sign-on-for-tng
  • https://www.wordfence.com/threat-intel/vulnerabilities/id/1d8d393e-764c-491d-8afb-7d4f8d0c387a?source=cve

Generated by PoC Generator on 2026-08-01T20:41:41.934265784

Frequently asked questions

What is CVE-2026-15964?

CVE-2026-15964 is a Critical (9.8) vulnerability: The Single Sign On For TNG plugin for WordPress is vulnerable to Authentication Bypass…. This entry ships a detection-only PoC and a Docker test lab.

How do I detect CVE-2026-15964?

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-2026-15964?

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.