SB2026041782 - Remote code execution in Marimo
Published: April 17, 2026
Security Bulletin ID
SB2026041782
CSH Severity
Critical
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Code execution
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Missing Authentication for Critical Function (CVE-ID: CVE-2026-39987)
CWE-ID: CWE-306 - Missing Authentication for Critical Function
CVSSv4: 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/E:A/U:Red
The vulnerability allows a remote attacker to execute arbitrary system commands.
The vulnerability exists due to missing authentication for a critical function in the terminal/ws WebSocket endpoint when handling WebSocket connections. A remote attacker can connect to the endpoint to execute arbitrary system commands.
The issue can expose a full interactive shell without authentication.
Remediation
Install update from vendor's website.