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CVE-2026-39987— marimo Affected by Pre-Auth Remote Code Execution via Terminal WebSocket Authentication Bypass

Quick assessment

Affected
marimo-team marimo
Exploitation
Confirmed exploitation in the wild; remediate immediately
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

marimo是marimo开源的一个交互式Python笔记本，支持响应式编程和SQL查询。 marimo 0.23.0之前版本存在访问控制错误漏洞，该漏洞源于终端WebSocket端点缺少身份验证，可能导致未经身份验证的攻击者获得完整PTY shell并执行任意系统命令。

AI Predicted 9.8 Difficulty: Easy KEV EPSS 37.87% · P99

Public Exploits 1

ExploitDB · 1 EDB-52673 [webapps]
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I. Basic Information for CVE-2026-39987

Vulnerability Information
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Vulnerability Title
marimo Affected by Pre-Auth Remote Code Execution via Terminal WebSocket Authentication Bypass
Source: CVE Program / CVE List V5
Vulnerability Description
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 WebSocket endpoints (e.g., /ws) that correctly call validate_auth() for authentication, the /terminal/ws endpoint only checks the running mode and platform support before accepting connections, completely skipping authentication verification. This vulnerability is fixed in 0.23.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
关键功能的认证机制缺失
Source: CVE Program / CVE List V5
Vulnerability Title
marimo 访问控制错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
marimo是marimo开源的一个交互式Python笔记本，支持响应式编程和SQL查询。 marimo 0.23.0之前版本存在访问控制错误漏洞，该漏洞源于终端WebSocket端点缺少身份验证，可能导致未经身份验证的攻击者获得完整PTY shell并执行任意系统命令。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

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Affected Products

Vendor Product Affected Versions CPE Subscribe
marimo-team marimo < 0.23.0 -

II. Public POCs for CVE-2026-39987

# POC Description Source Link Shenlong Link
1 Marimo versions <= 0.20.4 contain an unauthenticated remote code execution vulnerability. The terminal WebSocket endpoint /terminal/ws lacks authentication validation, allowing an unauthenticated attacker to connect via WebSocket, obtain a full PTY shell, and execute arbitrary OS commands on the underlying server. https://github.com/projectdiscovery/nuclei-templates/blob/main/javascript/cves/2026/CVE-2026-39987.yaml POC Details
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III. Intelligence Information for CVE-2026-39987

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Patches & Fixes for CVE-2026-39987 (2)

Vendor Advisories for CVE-2026-39987 (1)

IV. Related Vulnerabilities

Same product: marimo
Same vendor: marimo-team
Same weakness: CWE-306

V. Comments for CVE-2026-39987

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