PYSEC-2026-407 Marimo: Pre-Auth Remote Code Execution via Terminal WebSocket Authentication Bypass

Summary Marimo 19.6k stars has a Pre-Auth RCE vulnerability. The terminal WebSocket endpoint /terminal/ws lacks authentication validation, allowing an unauthenticated attacker to obtain a full PTY shell and execute arbitrary system commands. Unlike other WebSocket endpoints e.g., /ws that correct...

EUVD-2026-37809

marimo before 0.23.9 contains a reflected cross-site scripting vulnerability in the notebook page that allows unauthenticated attackers to inject arbitrary JavaScript by exploiting improper escaping of single quotes in the file query parameter reflected into an inline JavaScript string literal...

GHSA-8M59-7XV8-735H marimo contains a reflected cross-site scripting vulnerability in the notebook page

marimo before 0.23.9 contains a reflected cross-site scripting vulnerability in the notebook page that allows unauthenticated attackers to inject arbitrary JavaScript by exploiting improper escaping of single quotes in the file query parameter reflected into an inline JavaScript string literal...

CVE-2026-54386 marimo < 0.23.9 XSS via file Query Parameter in assets.py

marimo before 0.23.9 contains a reflected cross-site scripting vulnerability in the notebook page that allows unauthenticated attackers to inject arbitrary JavaScript by exploiting improper escaping of single quotes in the file query parameter reflected into an inline JavaScript string literal...

CVE-2026-54386

CVE-2026-54386 affects marimo prior to 0.23.9. A reflected XSS in the notebook page arises from improper escaping of single quotes in the file query parameter reflected into an inline JavaScript string. An unauthenticated attacker can craft a link with a payload (notably starting with new ) that ...

CVE-2026-54386 marimo < 0.23.9 XSS via file Query Parameter in assets.py

marimo before 0.23.9 contains a reflected cross-site scripting vulnerability in the notebook page that allows unauthenticated attackers to inject arbitrary JavaScript by exploiting improper escaping of single quotes in the file query parameter reflected into an inline JavaScript string literal...

PT-2026-50557

Name of the Vulnerable Software and Affected Versions marimo versions prior to 0.23.9 Description A reflected cross-site scripting issue exists in the notebook page. Unauthenticated attackers can inject arbitrary JavaScript by exploiting improper escaping of single quotes in the file query...

Exploit for Missing Authentication for Critical Function in Coreweave Marimo

CVE-2026-39987 - a full PTY shell Unauthenticated Stored Cross...

Attackers Use LLM Agent for Post-Exploitation After Marimo CVE-2026-39987 Exploit

An unknown threat actor has been observed using a large language model LLM agent to conduct post-compromise actions after obtaining initial access following the exploitation of a publicly-accessible Marimo network using a recently disclosed vulnerability. "The attacker compromised an...

Exploit for Missing Authentication for Critical Function in Coreweave Marimo

CVE-2026-39987 - Marimo Pre-Auth RCE Unauthenticated Remote...

Exploit for Missing Authentication for Critical Function in Coreweave Marimo

CVE-2026-39987 — marimo Pre-Auth Terminal WebSocket RCE Lab...

Exploit for Missing Authentication for Critical Function in Coreweave Marimo

CVE-2026-39987 — marimo Pre-Auth Terminal WebSocket RCE Lab...

Exploit for Missing Authentication for Critical Function in Coreweave Marimo

CVE-2026-39987 Lab Guide Pre-Auth Remote Code Execution v...

Exploit for Missing Authentication for Critical Function in Coreweave Marimo

CVE-2026-39987 — Marimo Pre-Auth RCE For educational and...

Python Library marimo < 0.23.0 Pre-Auth RCE (CVE-2026-39987)

The detected version of the marimo Python package is prior to 0.23.0. It is, therefore, affected by a remote code execution vulnerability: - The terminal WebSocket endpoint /terminal/ws lacks authentication validation, allowing an unauthenticated attacker to obtain a full PTY shell and execute...

CVE-2026-39987

marimo is a reactive Python notebook. Prior to 0.23.0, Marimo has a Pre-Auth RCE vulnerability. The terminal WebSocket endpoint /terminal/ws lacks authentication validation, allowing an unauthenticated attacker to obtain a full PTY shell and execute arbitrary system commands. Unlike other WebSock...

CISA Adds One Known Exploited Vulnerability to Catalog

CISA has added one new vulnerability to its Known Exploited Vulnerabilities KEV Catalog, based on evidence of active exploitation. CVE-2026-39987link is external Marimo Remote Code Execution Vulnerability This type of vulnerability is a frequent attack vector for malicious cyber actors and poses...

Marimo Remote Code Execution Vulnerability

Marimo contains an pre-authorization remote code execution vulnerability, allowing an unauthenticated attacked to shell access and execute arbitrary system commands...

Exploit for CVE-2026-39987

CVE-2026-39987 marimo is a reactive Python notebook. Prior to...

Exploit for CVE-2026-39987

CVE-2026-39987 — Marimo Python Notebook Pre-Authenticated Remo...