Hackers Pivot from marimo RCE to Internal Database Using LLM Agent

Gbhackers •Mayura Kathir • May 28, 2026

A newly observed intrusion demonstrates how attackers are replacing static playbooks with AI-driven agents that adapt in real time. The attack began on May 10, 2026, როდესაც threat actors exploited CVE-2026-39987, a remote code execution flaw in the marimo notebook environment. Once inside, the attacker harvested cloud credentials from environment files and system paths. Unlike […]

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This article is one source in a clustered incident — the cluster page carries the summary, timeline and every other outlet covering it.

Hackers Exploit Marimo RCE Using LLM Agent for Rapid Database Access On May 10, 2026, threat actors exploited CVE-2026-39987, a remote code execution vulnerability in the marimo notebook environment, to gain unauthorized access to internal databases. The attackers utilized a large language model (LLM) agent to automate their post-exploitation activities, successfully pivoting from the compromised notebook server to the internal database in under two minutes. This incident highlights a shift in attack methodologies, moving away from static playbooks to dynamic, AI-driven strategies. The breach allowed the attackers to harvest cloud credentials from environment files and system paths, potentially affecting numerous organizations using the marimo environment. The exploitation of this vulnerability was first publicly disclosed on April 13, 2026, and was added to the CISA KEV list for active exploitation on April 23, 2026. As of now, the full scope of the impact remains unclear, but organizations are urged to assess their defenses against similar tactics. 4 sources 71

Extracted Entities

CVEs (1)

CVE-2026-39987

MITRE ATT&CK (1)

T1552.001 - Credentials In Files