Marimo Notebook Flaw Could Run MCP Commands Before Cells Execute in Edit Mode

The Hacker News 25 August 2026, 15:43 EEST Security

Marimo has addressed a high-severity security flaw in its notebook software that allowed an attacker to execute an attacker-supplied Model Context Protocol (MCP) command in a specially crafted notebook, according to VulnCheck's CVE Numbering Authority (CNA) record. The CNA record says the command can run as a local subprocess when the notebook is opened in edit mode. The vulnerability, tracked…

Read the full story on The Hacker News https://thehackernews.com/2026/08/marimo-notebook-flaw-could-run-mcp.html

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