Critical Marimo Security Vulnerability Enables Remote Code Execution Attacks

A critical security vulnerability in the Marimo Python notebook framework is being actively exploited to achieve pre-authentication remote code execution (RCE), allowing attackers to gain full control of exposed systems. Tracked as CVE-2026-39987, the flaw stems from a missing authentication check in a WebSocket terminal endpoint, enabling attackers to spawn system-level shells without logging in. Security […] The post Critical Marimo Security Vulnerability Enables Remote Code Execution Attacks appeared first on Cyber Security News.