A threat actor exploited CVE-2026-39987 in publicly-accessible Marimo notebooks to gain initial access, then deployed an LLM agent to conduct post-exploitation activities. The attacker successfully extracted cloud credentials from the compromised system, demonstrating a novel attack technique combining traditional vulnerability exploitation with AI-powered automation.
An unknown threat actor has been observed using a large language model (LLM) agent to conduct post-compromise actions after obtaining initial access following the exploitation of a publicly-accessible Marimo network using a recently disclosed vulnerability. "The attacker compromised an internet-reachable Marimo notebook via CVE-2026-39987, extracted two cloud credentials from the compromised
Originally published at thehackernews.com
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