Abused AI pentest tool ARTEX exposed 26,739 servers across 70+ Japanese brokerages
robleclerc · x · 2026-10-26
GMO Internet Group CEO Masatoshi Kumagai warns 'the internet itself is starting to break.' An investigation by GMO Cybersecurity by Ierae confirmed that unauthorized access targeting roughly 20 Japanese companies originated from 'ARTEX,' an autonomous AI penetration-testing tool originally built for defense, being abused.
The breach exposed up to 26,739 servers and trading accounts across 70+ brokerages and FX firms. GMO has asked Japan to invoke its new Active Cyber Defense law, in force since October 1.
Key warning: with simple instructions, AI can now autonomously search for weaknesses and run all the way to intrusion.
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