CVE-2026-39987

CriticalCVSS 9.8/10Known exploited (CISA KEV)Last modified Jun 17, 2026

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.

Metrics

CVSS 3.1 9.8/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weakness enumeration

CWE-306

Affected software

No affected versions have been published.

Timeline

Published: Apr 9, 2026
Last modified: Jun 17, 2026
Added to CISA KEV: Apr 23, 2026
NVD status: Analyzed

Related CVEs from 2026

CVE-2026-399895.3A server-side request forgery (SSRF) vulnerability has been reported to affect Download Station. If a remote attacker gains a user account, CVE-2026-39998.8A broken access control may allow an authenticated user to perform a horizontal privilege escalation. The vulnerability only impacts specif CVE-2026-399914.8A cross-site scripting (XSS) vulnerability has been reported to affect Notes Station 3. If a remote attacker gains a user account, they can CVE-2026-399938.7A relative path traversal vulnerability has been reported to affect Download Station. If a remote attacker gains a user account, they can th CVE-2026-399978.9A missing authentication for critical function vulnerability has been reported to affect HybridDesk Station. If exploited, the vulnerability CVE-2026-399988.8Improper Input Validation vulnerability in Apache APISIX. The attacker can take advantage of certain configuration in forward-auth plugin t CVE-2026-399999.1Authentication Bypass by Spoofing vulnerability in Apache APISIX. The attacker can completely bypass authentication capitalising on certain CVE-2026-400001.8The Activity zte.com.cn.filer/zte.com.cn.filer.FilePreViewActivity within ZTE File Manager is designed to preview compressed files. Third-pa CVE-2026-400015.2There is a local privilege escalation vulnerability in the ZTE PROCESS Guard service of the cloud computer client, which may allow local arb CVE-2026-400028.8Red Magic 11 Pro (NX809J) contains a vulnerability that allows non-privileged applications to trigger sensitive operations. The vulnerabilit CVE-2026-400036.8ZTE ZX297520V3 BootROM contains a vulnerability that allows arbitrary memory writes via USB. Attackers can exploit the lack of target addres CVE-2026-400047.8There exists an openssl.cnf privilege escalation vulnerability in ZTE Cloud PC client uSmartview. An attacker can execute arbitrary code loc