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Attackers Use LLM Agent for Post-Exploitation After Marimo CVE-2026-39987 Exploit

·Source: The Hacker News

Updated:

Executive Summary

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

Analysis

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

Indicators of Compromise (1)

CVE (1)
CVE-2026-39987
Source Attribution

Originally published by The Hacker News on May 29, 2026.

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