CVE-2026-39987 — Updated!
Simple POC for CVE-2026-39987
CVE-2026-39987 Exploit POC
Overview
This repository contains a Proof-of-Concept (POC) script for CVE-2026-39987, a pre-authentication Remote Code Execution (RCE) vulnerability in Marimo. The exploit leverages a WebSocket endpoint to execute arbitrary commands on the target system.
Vulnerability Details
- CVE ID: CVE-2026-39987
- Affected Component: Terminal WebSocket endpoint (
/terminal/ws) - Impact: Unauthorized remote code execution without authentication
- Affected Versions: <= 0.20.4
Advisory Reference
Prerequisites
- Python 3.x
- Required packages:
pip install websocket-client
Usage
python exploit.py -u <TARGET_URL> [-c ""]
python exploit.py -u http://example.com:2718 -c "cat /etc/passwd"
Parameters
-u, --url: Target URL (e.g., http://localhost:2718)
-c --command: Command to execute (defaults to id && whoami && hostname)
-h, --help
Disclaimer
This script is intended for educational and research purposes only.
Use responsibly and only against systems you own or have explicit permission to test.
Misuse of this tool may result in unintended consequences and potential security risks.
By using this script, you acknowledge that you are solely responsible for any actions taken.