---
format: "aidr-story-markdown/v1"
id: "99aca8bf6838e1b1666436d429ccd16c413ceea16a8582ef9103eddc7c57872e"
canonical_url: "https://aidr.today/99aca8bf?lang=en"
title: "GMO Internet CEO Blames Autonomous AI Tool for Brokerage Cyberattack"
lang: "en"
requested_lang: "en"
available_langs: ["en","vi"]
translation_fallback: null
fallback_fields: []
published_at: "2026-10-25T16:24:19.000Z"
category: "Agents"
topics: ["safety"]
source_urls: ["https://marketbrief.now/cybersecurity/gmo-internet-ceo-blames-autonomous-ai-tool-for-brokerage-cyberattack-54af5a83","https://x.com/AndrewCurran_/status/2114242724971020787","https://x.com/AndrewCurran_/status/2114247009612050491","https://x.com/choblin29/status/2114257893352780068","https://x.com/choblin29/status/2114386740354183573","https://x.com/choblin29/status/2114389428038951128","https://x.com/_NathanCalvin/status/2114379215084667206","https://x.com/8teAPi/status/2114262212470886810"]
summary: "GMO Internet Group CEO Masatoshi Kumagai attributed a cyberattack affecting roughly 20 Japanese companies to the misuse of an autonomous AI penetration-testing tool called ARTEX, which exposed up to 26,739 servers and enabled unauthorized trades across more than 70 brokerages. Kumagai stated that internal security warnings about vulnerabilities in the breached cloud VPS service were not addressed quickly enough, and he has requested government assistance under Japan's active cyber defense powers to trace and neutralize the attackers."
---

# GMO Internet CEO Blames Autonomous AI Tool for Brokerage Cyberattack

> [Open the canonical story](<https://aidr.today/99aca8bf?lang=en>)

**Published:** 2026-10-25T16:24:19.000Z
**Category:** Agents
**Topics:** safety

## Summary

GMO Internet Group CEO Masatoshi Kumagai attributed a cyberattack affecting roughly 20 Japanese companies to the misuse of an autonomous AI penetration\-testing tool called ARTEX, which exposed up to 26,739 servers and enabled unauthorized trades across more than 70 brokerages\. Kumagai stated that internal security warnings about vulnerabilities in the breached cloud VPS service were not addressed quickly enough, and he has requested government assistance under Japan's active cyber defense powers to trace and neutralize the attackers\.

## Sources

- [Story source](<https://marketbrief.now/cybersecurity/gmo-internet-ceo-blames-autonomous-ai-tool-for-brokerage-cyberattack-54af5a83>)
- [Story source](<https://x.com/AndrewCurran_/status/2114242724971020787>)
- [Supporting source](<https://x.com/AndrewCurran_/status/2114247009612050491>)
- [Supporting source](<https://x.com/choblin29/status/2114257893352780068>)
- [Story source](<https://x.com/choblin29/status/2114386740354183573>)
- [Supporting source](<https://x.com/choblin29/status/2114389428038951128>)
- [Story source](<https://x.com/_NathanCalvin/status/2114379215084667206>)
- [Supporting source](<https://x.com/8teAPi/status/2114262212470886810>)