CVE-2026-39987

CVE-2026-39987 marimo is a reactive Python notebook. Prior to 0.23.0, Marimo has a Pre-Auth RCE vulnerability / | |// / / / / / / |/ |/ \ / | | | \ /| | /| //|/|/ / | | | / -----/ | |/ |/ ----- \ | |/ \ / / / / //// / | |// CVE-2026-39987 Marimo /terminal/ws — Unauthenticated WebSocket...

CVE-2026-39987

CVE-2026-39987 — Marimo Pre-Auth RCE /terminal/ws CVSS 4.0 : 9.3 CRITICAL CVSS 3.x : 9.8 CRITICAL CWE : CWE-306 Missing Authentication for Critical Function Fix : Marimo 0.23.0+ Affects : Marimo Lab / authorized testing only HTB, CTF, engagement with written scope. Table of contents Vulnerability...

CVE-2026-39987

CVE-2026-39987 - marimo Terminal WebSocket Authentication Bypass poc Overview This repository contains CVE-2026-39987 affecting marimo versions before 0.23.0. The vulnerability exists in the terminal WebSocket endpoint, where insufficient authentication enforcement may allow an unauthenticated...

CVE-2026-39987

CVE-2026-39987 For Marimo 0.20.4 PoC ⚠️ This tool is intended for educational purposes and authorized security testing only. The creator is not responsible for any unauthorized or illegal use. Use at your own risk. ⚠️ Info: CVE-2026-39987 is a critical pre-authentication Remote Code Execution RCE...

cohort-htb

Cohort — HTB writeup & exploit chain Machine Cohort HackTheBox. Full kill chain: 1. SSRF in the Flask API /api/validate → internal vhost discovery 2. Pre-auth RCE in Marimo 0.20.4 WebSocket terminal CVE-2026-39987 → shell as marimo 3. Privilege escalation via PackageKit 1.2.8 D-Bus TOCTOU...

cve-2026-39987

cve-2026-39987 Installation • Usage • Examples I'm just trying out Go :D Btw: CVE-2026-39987 PoC: Marimo:PORT/terminal/ws REDACTED@REDACTED:$ uname -a Linux ... REDACTED@REDACTED:$ exit exit INF:normalclose websocket: close 1000 normal: Terminal session ended Custom Command -c: cve-2026-39987 -t...

CVE-2026-39987_POC

PoC — CVE-2026-39987 · Marimo Pre-Auth RCE CVSS 4.0: 9.3 Critical · AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H Affects: marimo 2 calls to validateauth. terminal.py - 0 @requires, 0 validateauth. -- the flaw. The AuthBackend middleware protects HTTP and the /ws websocket, but /terminal/ws accepts the...

CVE-2026-39987-Poc

CVE-2026-39987-Poc Proof of Concept PoC WebSocket client for CVE-2026-39987 Marimo Pre-Auth RCE, intended for authorized security testing. ⚠️ Disclaimer This script/tool is provided for educational, research, and authorized testing purposes only. It is designed to be used on systems where you have...

CVE-2026-39987

CVE-2026-39987 — Marimo Pre-Auth RCE via Terminal WebSocket / / | / / / | \ / \ \ / / | // / \ / / | | / / // // / / // // \ / Status: Patched in 0.23.0 — marimo-team/marimo@c24d480 Vulnerability The /terminal/ws endpoint lacks the validateauth call present in every other authenticated endpoint...

CVE-2026-39987-Lab

CVE-2026-39987 — marimo Pre-Auth Terminal WebSocket RCE Lab Local-only Docker lab for reproducing and understanding CVE-2026-39987 in marimo. This project compares a vulnerable marimo service with a patched marimo service side-by-side, then demonstrates the difference using a least-harm proof...

CVE-2026-39987_exploit

🔥 CVE-2026-39987 | Marimo Pre-Auth RCE Exploit Exploitation Framework | Full Remote Code Execution RCE | WebSocket Auth Bypass 🧠 To know the commands more Open the file website.html 🎯 Overview This exploit targets Marimo applications running WebSocket on port 2718 default. The vulnerability allow...

CVE-2026-39987

CVE-2026-39987 — Marimo Python Notebook Pre-Authenticated Remote Code Execution TL;DR A pre-authenticated remote code execution vulnerability in Marimo , an open-source Python notebook for data science and AI/ML. The terminal WebSocket endpoint /terminal/ws completely skips authentication...

CVE-2026-39987

CVE-2026-39987 — Marimo Pre-Auth RCE For educational and authorized security research purposes only. Description Pre-authenticated Remote Code Execution in Marimo = 0.20.4. The WebSocket endpoint /terminal/ws skips authentication validation, allowing an unauthenticated attacker to obtain a full...

marimo_CVE-2026-39987_RCE_PoC

CVE-2026-39987 - Marimo This script is ONLY for educational purposes and authorized testing. Unauthorized use of this tool against systems without explicit permission is ILLEGAL. The author is not responsible for the misuse of this information. 📋 Description Marimo versions prior to 0.23.0 presen...

CVE-2026-39987-lab-or-marimo-cve-lab

CVE-2026-39987 Lab Guide Pre-Auth Remote Code Execution via Terminal WebSocket Authentication Bypass An educational Docker lab for understanding, reproducing, and patching this critical vulnerability in marimo. Table of Contents Overview Architecture Quick Start Step-by-Step Walkthrough Step 1:...

CVE-2026-39987_PoC

CVE-2026-39987-PoC Disclaimer This script is for educational and authorized testing purposes ONLY. Unauthorized use of this tool against systems without explicit permission is ILLEGAL. The author is not responsible for any misuse of this information. Marimo versions prior to 0.23.0 have a critica...

CVE-2026-39987

⚠️ CVE-2026-39987 — Unauthenticated Shell in marimo 0.23.0 A reactive Python notebook tool gave attackers a full shell in one WebSocket request. 📌 Overview CVE-2026-39987 is a critical pre-auth RCE vulnerability in marimo — a popular open-source reactive notebook for Python modern Jupyter...

CVE-2026-39987-POC

CVE-2026-39987 - Marimo 0.23.0 Pre-Auth RCE WebSocket Proof of Concept PoC exploit for a Critical Pre-Authentication Remote Code Execution RCE vulnerability in Marimo versions prior to 0.23.0. The vulnerability allows an unauthenticated attacker to connect to the WebSocket endpoint /terminal/ws a...

CVE-2026-39987-Marimo-Preauth-RCE

CVE-2026-39987 Marimo Pre-auth RCE Research Overview This project focuses on CVE-2026-39987, a pre-authentication Remote Code Execution vulnerability in Marimo related to the terminal WebSocket endpoint /terminal/ws. Marimo is an open-source reactive Python notebook that allows users to write and...

CVE-2026-39987-marimo-rce

CVE-2026-39987 - Marimo Pre-Auth RCE Unauthenticated Remote Code Execution in Marimo via WebSocket Terminal 📌 Overview CVE-2026-39987 is a critical Pre-Authentication Remote Code Execution vulnerability affecting Marimo versions prior to 0.23.0. The /terminal/ws WebSocket endpoint completely...