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CVE-2026-39987 is a vulnerability classified as Missing Authentication for Critical Function, affecting marimo (affected versions: < 0.23.0). This vulnerability is rated Critical, with a CVSS score of 9.3. This vulnerability has been observed being exploited in the wild.
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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.
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