WorldPosted at: Nov 14 2026 6:05PM


Japan steps up cyber defences after data breaches hit Osaka, major companies

Tokyo, Nov 14 (UNI) Japan is reportedly facing a growing wave of cyberattacks targeting businesses and government institutions, after hackers compromised an email delivery service and exposed more than 1 million email addresses linked to the City of Osaka's online administrative services.
The breach, disclosed by Osaka officials, involved Arara, a Japanese email delivery service used by hundreds of organisations. The company said a November 2 cyberattack exposed approximately 77 million email addresses belonging to nearly 400 customers, including the Osaka city government's technology provider, TKC Corporation, and video game company Sega, Nacionale reported.
The Osaka city government said the exposed addresses belonged to people who received emails through its administrative services between July 2026 and October 31. It warned residents to remain alert to suspicious messages impersonating municipal authorities and avoid clicking unfamiliar links or opening attachments.
The city, which has approximately 2.8 million residents, said its online administrative platform was maintained by TKC, which relied on Arara's email delivery system.
The incident is part of a wider series of cyberattacks affecting Japanese organisations since September. Earlier, the Osaka Prefecture government, a separate administrative authority, disclosed a data breach involving participants in a food assistance programme.
Japan has faced repeated cyber incidents targeting major corporations and public institutions, including Japan Airlines, Sony Network Communications and Capcom.
Cybersecurity researchers have warned that attacks against Japanese organisations increased from July and accelerated in October, highlighting vulnerabilities in corporate networks and third-party service providers.
No single organisation has been publicly identified as responsible for the entire series of incidents. Ransomware groups, inadequate basic security practices and weaknesses in third-party technology providers have all emerged as potential factors.
Japan's Prime Minister Sanae Takaichi has convened a cabinet meeting on cybersecurity as the government seeks to strengthen the country's digital infrastructure.
Takaichi has urged her ministers to strengthen a recent cybersecurity act to enable the government to better detect and analyze cyberattacks in order to bolster prevention and containment capabilities.
The government has allocated approximately $62 million towards improving cybersecurity capabilities, including threat detection, intelligence gathering and assistance for organisations affected by cyber incidents.
The latest breaches have intensified scrutiny of Japan's reliance on external technology providers and highlighted the risks posed by attacks on widely used digital services.
The incidents underscore how a security failure at a single service provider can expose millions of users across multiple organisations, including government agencies and major corporations.UNI XC AAB
Tags: #Japan steps up cyber defences after data breaches hit Osaka# major companies
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