The breach may have exposed up to 26,739 servers, and GMO CEO Masatoshi Kumagai previously blamed the misuse of an autonomous AI penetration-testing tool known as ARTEX. Kumagai acknowledged that internal security teams had flagged vulnerabilities in the service before the attack, but the company failed to implement fixes quickly enough. Kihara described the ongoing wave of cyberattacks as a serious risk to national safety and called for urgent countermeasures to protect economic stability.
Monday, October 26, 2026
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Japan Convenes Cabinet-Level Meeting After GMO Breach Hits More Than 70 Brokerages
Cybersecurity4 hours ago
Prime Minister Sanae Takaichi and senior ministers are holding a cabinet-level meeting to address systemic cybersecurity threats following a series of attacks that targeted Japan's financial infrastructure. The discussions follow a breach of GMO Internet Group's cloud VPS service that enabled hackers to perform unauthorized trades across more than 70 foreign-exchange and securities firms. GMO shares fell 11% in early Monday trading after the company announced it would compensate verified trading losses. Although GMO requested that the government invoke new active cyber defense powers to neutralize the attackers' systems, Chief Cabinet Secretary Kihara stated that such actions remain the jurisdiction of the police or Self-Defence Forces.
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