CVE-2026-39987 | marimo-team marimo up to 0.22.x WebSocket Endpoint /terminal/ws validate_auth missing authentication

VDB-356624 · CVE-2026-39987 · GCVE-0-2026-39987 MARIMO-TEAM MARIMO UP TO 0.22.X WEBSOCKET ENDPOINT /TERMINAL/WS VALIDATE_AUTH MISSING AUTHENTICATION HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 7.0 $0-$5k 1.16+ Summaryinfo A vulnerability, which was classified as critical, was found in marimo-team marimo up to 0.22.x. This issue affects the function validate_auth of the file /terminal/ws of the component WebSocket Endpoint. Such manipulation leads to missing authentication. This vulnerability is traded as CVE-2026-39987. The attack may be launched remotely. There is no exploit available. You should upgrade the affected component. Detailsinfo A vulnerability was found in marimo-team marimo up to 0.22.x. It has been rated as critical. Affected by this issue is the function validate_auth of the file /terminal/ws of the component WebSocket Endpoint. The manipulation with an unknown input leads to a missing authentication vulnerability. Using CWE to declare the problem leads to CWE-306. The product does not perform any authentication for functionality that requires a provable user identity or consumes a significant amount of resources. Impacted is confidentiality, integrity, and availability. CVE summarizes: 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. The advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-39987 since 04/08/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. There are known technical details, but no exploit is available. Upgrading to version 0.23.0 eliminates this vulnerability. Productinfo Vendor marimo-team Name marimo Version 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 0.10 0.11 0.12 0.13 0.14 0.15 0.16 0.17 0.18 0.19 0.20 0.21 0.22 Website Product: https://github.com/marimo-team/marimo/ CPE 2.3info 🔒 🔒 🔒 CPE 2.2info 🔒 🔒 🔒 CVSSv4info VulDB Vector: 🔒 VulDB Reliability: 🔍 CNA CVSS-B Score: 🔒 CNA CVSS-BT Score: 🔒 CNA Vector: 🔒 CVSSv3info VulDB Meta Base Score: 7.3 VulDB Meta Temp Score: 7.0 VulDB Base Score: 7.3 VulDB Temp Score: 7.0 VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv2info Vector Complexity Authentication Confidentiality Integrity Availability Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock VulDB Base Score: 🔒 VulDB Temp Score: 🔒 VulDB Reliability: 🔍 Exploitinginfo Class: Missing authentication CWE: CWE-306 / CWE-287 CAPEC: 🔒 ATT&CK: 🔒 Physical: No Local: No Remote: Yes Availability: 🔒 Status: Not defined Price Prediction: 🔍 Current Price Estimation: 🔒 0-Day Unlock Unlock Unlock Unlock Today Unlock Unlock Unlock Unlock Threat Intelligenceinfo Interest: 🔍 Active Actors: 🔍 Active APT Groups: 🔍 Countermeasuresinfo Recommended: Upgrade Status: 🔍 0-Day Time: 🔒 Upgrade: marimo 0.23.0 Timelineinfo 04/08/2026 CVE reserved 04/09/2026 +1 days Advisory disclosed 04/09/2026 +0 days VulDB entry created 04/09/2026 +0 days VulDB entry last update Sourcesinfo Product: github.com Advisory: github.com Status: Confirmed CVE: CVE-2026-39987 (🔒) GCVE (CVE): GCVE-0-2026-39987 GCVE (VulDB): GCVE-100-356624 Entryinfo Created: 04/09/2026 19:43 Changes: 04/09/2026 19:43 (69) Complete: 🔍 Cache ID: 99:16F:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸