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CVE-2026-75977 — The Mang Board WP plugin for WordPress is vulnerable to Missing Authorization via…

Key facts

CVE-2026-75977 is a High (8.8) vulnerability: The Mang Board WP plugin for WordPress is vulnerable to Missing Authorization via…. This entry ships a detection-only PoC and a Docker test lab.
CVE CVE-2026-75977
Severity High (8.8)
Detection / prevention —
PoC poc.py
Source 2026/CVE-2026-75977/

Details

English | 한국어

Description

The Mang Board WP plugin for WordPress is vulnerable to Missing Authorization via Authentication Cookie Forgery in all versions up to, and including, 2.3.7. This is due to flawed HMAC generation in the mbw_get_hash_key() function that uses the current user's identity instead of the cookie username parameter when a WordPress user is logged in, combined with insufficient validation in mbw_validate_auth_cookie(). This makes it possible for authenticated attackers, with subscriber-level access and above, to forge administrator authentication cookies and change administrator passwords to achieve complete site takeover.

Vulnerability Details

Property Value
CVE ID CVE-2026-75977
CVSS Score 8.8

Proof of Concept

Download

# Download PoC script
curl -O https://raw.githubusercontent.com/fankh/vulnerability-poc/main/2026/CVE-2026-75977/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-2026-75977

# 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/mangboard/tags/2.3.5/api/mb-template.php#L36
  • https://plugins.trac.wordpress.org/browser/mangboard/tags/2.3.5/includes/functions/func.board.php#L1581
  • https://plugins.trac.wordpress.org/browser/mangboard/tags/2.3.5/includes/functions/func.board.php#L32
  • https://plugins.trac.wordpress.org/browser/mangboard/tags/2.3.5/includes/functions/func.user.php#L447
  • https://plugins.trac.wordpress.org/browser/mangboard/tags/2.3.5/models/admin/users.php#L125
  • https://plugins.trac.wordpress.org/browser/mangboard/tags/2.3.6/api/mb-template.php#L36
  • https://plugins.trac.wordpress.org/browser/mangboard/tags/2.3.6/includes/functions/func.board.php#L1581
  • https://plugins.trac.wordpress.org/browser/mangboard/tags/2.3.6/includes/functions/func.board.php#L32
  • https://plugins.trac.wordpress.org/browser/mangboard/tags/2.3.6/includes/functions/func.user.php#L447
  • https://plugins.trac.wordpress.org/browser/mangboard/tags/2.3.6/models/admin/users.php#L125
  • https://plugins.trac.wordpress.org/changeset/3664567/
  • https://www.wordfence.com/threat-intel/vulnerabilities/id/ae75196d-2128-4da8-a90b-a62454dcdbe9?source=cve

Generated by PoC Generator on 2026-09-03T16:16:18.830468132

Frequently asked questions

What is CVE-2026-75977?

CVE-2026-75977 is a High (8.8) vulnerability: The Mang Board WP plugin for WordPress is vulnerable to Missing Authorization via…. This entry ships a detection-only PoC and a Docker test lab.

How do I detect CVE-2026-75977?

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-2026-75977?

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.