CVE-2026-39987— marimo Affected by Pre-Auth Remote Code Execution via Terminal WebSocket Authentication Bypass
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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: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
关键功能的认证机制缺失
Source: NVD (National Vulnerability Database)
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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