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CVE-2026-19883 — The WPeMatico RSS Feed Fetcher plugin for WordPress is vulnerable to unauthorized…

Key facts

CVE-2026-19883 is a High (8.8) vulnerability: The WPeMatico RSS Feed Fetcher plugin for WordPress is vulnerable to unauthorized…. This entry ships a detection-only PoC and a Docker test lab.
CVE CVE-2026-19883
Severity High (8.8)
Detection / prevention —
PoC poc.py
Source 2026/CVE-2026-19883/

Details

English | 한국어

Description

The WPeMatico RSS Feed Fetcher plugin for WordPress is vulnerable to unauthorized modification of data that can lead to privilege escalation due to a missing capability check on the wpematico_import_settings function in all versions up to, and including, 2.8.24. This makes it possible for authenticated attackers, with subscriber-level access and above, to update arbitrary options on the WordPress site. This can be leveraged to update the default role for registration to administrator and enable user registration for attackers to gain administrative user access.

Vulnerability Details

Property Value
CVE ID CVE-2026-19883
CVSS Score 8.8

Proof of Concept

Download

# Download PoC script
curl -O https://raw.githubusercontent.com/fankh/vulnerability-poc/main/2026/CVE-2026-19883/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-2026-19883

# 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/etruel/wpematico/commit/e297f41b49c6ec76635b006dff8a964a99a1ed24
  • https://plugins.trac.wordpress.org/browser/wpematico/tags/2.8.23/app/tools_page.php#L224
  • https://plugins.trac.wordpress.org/browser/wpematico/tags/2.8.23/app/wpematico_functions.php#L2077
  • https://plugins.trac.wordpress.org/browser/wpematico/tags/2.8.23/app/wpematico_functions.php#L2096
  • https://plugins.trac.wordpress.org/browser/wpematico/tags/2.8.23/wpematico_class.php#L59
  • https://plugins.trac.wordpress.org/browser/wpematico/tags/2.8.24/app/tools_page.php#L224
  • https://plugins.trac.wordpress.org/browser/wpematico/tags/2.8.24/app/wpematico_functions.php#L2077
  • https://plugins.trac.wordpress.org/browser/wpematico/tags/2.8.24/app/wpematico_functions.php#L2096
  • https://plugins.trac.wordpress.org/browser/wpematico/tags/2.8.24/wpematico_class.php#L59
  • https://www.wordfence.com/threat-intel/vulnerabilities/id/4e591cb4-058d-4d8e-948e-d65ab01db618?source=cve

Generated by PoC Generator on 2026-08-22T13:27:23.016631465

Frequently asked questions

What is CVE-2026-19883?

CVE-2026-19883 is a High (8.8) vulnerability: The WPeMatico RSS Feed Fetcher plugin for WordPress is vulnerable to unauthorized…. This entry ships a detection-only PoC and a Docker test lab.

How do I detect CVE-2026-19883?

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-2026-19883?

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.