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Japan’s GMO Internet Group CEO Admits Internal Security Warnings Were Ignored Prior to Major Cyber Breach

Summary by OODA Loop
GMO Internet Group CEO Masatoshi Kumagai publicly admitted that internal engineers and white-hat hackers had previously flagged security vulnerabilities that were inadequately addressed. The acknowledgment follows a significant cyber breach targeting the company’s services, resulting in leaked customer account credentials and subsequent fraudulent transactions. In response to the incident, company executives have called on the […]

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Japanese tech CEO Masatoshi Kumagai has issued an unusually grim warning after a serious hacker attack on his company GMO, one of Japan's most important

·Copenhagen, Denmark
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On the 26th, Masatoshi Kumagai, president of GMO Internet Group, revealed that the company had been demanded to pay $50 million (approximately 8 billion yen) by attackers in connection with an unauthorized access incident at one of its subsidiary companies. When the company refused to pay, the attackers released personal information believed to belong to one of the customers at noon that same day. Should GMO pay the ransom to protect its custome…

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On the 27th, entrepreneur Yuji Mizoguchi commented on Masatoshi Kumagai, president of GMO Internet Group, which was attacked by hackers. GMO's cloud service was subjected to unauthorized access, resulting in the leakage of customer information...

·Osaka, Japan
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OODA Loop broke the news on Monday, October 26, 2026.
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