Human attacker exploits Marimo RCE in seconds
A security researcher at Sysdig reports that a human attacker exploited a vulnerability in the Marimo notebook platform and reached an SSH bastion host in eight seconds, a speed usually seen with AI-driven hacks. The operator used a custom toolkit and avoided detection methods that catch AI agents, confirming no large language model was used. The Marimo flaw allowed unauthenticated access and has since been patched.
- Attacker exploited Marimo CVE-2026-39987 remotely
- Reached SSH bastion host in eight seconds
- Custom toolkit, no AI involvement detected
- Credentials harvested from host and AWS Secrets Manager
- Patch released in Marimo version 0.23.0
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