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.
CISA Known Exploited Vulnerability
Date added 2026-04-23 | Due date 2026-05-07
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Problem types
CWE-306: Missing Authentication for Critical Function
Product status
References
www.sysdig.com/...sclosure-to-exploitation-in-under-10-hours
www.cisa.gov/...erabilities-catalog?field_cve=CVE-2026-39987
github.com/...marimo/security/advisories/GHSA-2679-6mx9-h9xc
github.com/marimo-team/marimo/pull/9098
github.com/...ommit/c24d4806398f30be6b12acd6c60d1d7c68cfd12a