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GMO Internet says attacker leaked customer data from Onamae cloud desktop service

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GoKawiil Brief

GMO Internet is investigating suspected unauthorized access to its Onamae cloud desktop service, which provides virtualized desktops to financial traders. The company says an attacker has published data allegedly tied to customers and its business, though it has not fully verified the leak's contents, and up to 27,000 servers may be affected. GMO has urged customers to reset passwords after reports of unauthorized activity on trading accounts.

Why It Matters

GoKawiil's interpretation of the reporting above, not reported fact.

The breach follows GMO's own cybersecurity unit recently flagging a Chinese AI-powered penetration tool, Artex, used in attacks on Japanese firms and South Korean banks, though GMO has not confirmed any link between Artex and the Onamae incident. Japan's Financial Services Agency had already warned in May that financial institutions should brace for rising cybersecurity threats, suggesting regulators anticipated incidents like this one targeting trading infrastructure.

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Source: techcrunch.com — Kate Park, 2026-10-27

Published there as: “Japan internet giant GMO says hackers posted stolen customer data”

Read the original report → The summary and analysis above are GoKawiil's own, written from reporting by the source above. Facts and quotes belong to the original publisher.