marimo Affected by Pre-Auth Remote Code Execution via Terminal WebSocket Authentication Bypass_CVE-2026-39987

{
    "lastseen": "",
    "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.",
    "published": "2026-04-09T17:16:55.639Z",
    "modified": "2026-04-09T17:44:29.019Z",
    "type": "cve",
    "title": "marimo Affected by Pre-Auth Remote Code Execution via Terminal WebSocket Authentication Bypass",
    "source": "GitHub_M",
    "references": "https://github.com/marimo-team/marimo/security/advisories/GHSA-2679-6mx9-h9xc\nhttps://github.com/marimo-team/marimo/pull/9098\nhttps://github.com/marimo-team/marimo/commit/c24d4806398f30be6b12acd6c60d1d7c68cfd12a",
    "id": "CVE-2026-39987",
    "bulletinFamily": "",
    "cwe": [
        "CWE-306"
    ],
    "cvelist": null,
    "sourceData": "marimo-team marimo < 0.23.0",
    "sourceHref": "",
    "cvss": {
        "score": 9.3,
        "severity": "CRITICAL",
        "vector": "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",
        "version": "4.0"
    },
    "cvss2": [],
    "cvss3": {
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        "baseScore": 0,
        "baseSeverity": "",
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        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
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    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "marimo",
    "version": "< 0.23.0",
    "vendor": "marimo-team",
    "ai_description": "",
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    "ai_score": 0
}