Japanese banks report surge in AI‑related security flaws, prompting tighter cyber defenses

Financial institutions are being advised to strengthen their cyber defenses, including temporary service suspensions.

Japanese banks face a growing threat of cyberattacks as AI models become more sophisticated. (Photo by Akira Kodaka)

Nikkei staff writers

October 2, 2026 02:51 JST

Tokyo – Major Japanese banks have reported a sharp rise in system vulnerabilities, Nikkei has learned, as new artificial intelligence tools introduce both cybersecurity opportunities and risks.

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