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Japan Takes Action Against Websites Leaking GMO Cyberattack Data

Oct 29, 2026
Japan Takes Action Against Websites Leaking GMO Cyberattack Data

The Japanese government has taken decisive action following a cyberattack on GMO, instructing major telecommunications operators to block access to websites that are believed to contain personal information stolen during the incident. This directive emerged on October 29, as authorities sought to mitigate the risk of further exposure of sensitive data online.

One of the websites associated with the attackers has already been rendered inaccessible after its domain was suspended, reportedly due to actions taken by a U.S.-based service provider. In addition, the government has communicated its request through an industry association, urging domestic telecommunications companies to implement a blocking measure. This involves identifying the websites that users attempt to access and preventing connections to those designated sites.

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The government's initiative is part of a broader effort to contain the fallout from the unauthorized access to GMO's systems. By restricting access to these websites, officials aim to limit the distribution and visibility of personal information that may have been compromised during the cyberattack. Chief Cabinet Secretary Kihara reiterated the government's stance on the importance of safeguarding personal information, asserting that the publication of such data online and the infringement of privacy rights are unacceptable.

Telecoms Play Key Role in Response

As the government works to disable the offending sites, telecommunications operators are positioned at the forefront of the response to this information leak. The urgency of the situation is underscored by the increasing frequency of cyberattacks targeting major companies in Japan, prompting GMO to offer a reward of approximately 150 million yen for information leading to the identification of the hackers responsible for the breach.

Approved for Dissemination

In a related context, Japan is currently experiencing its first major cold spell of the season, with record-low autumn temperatures reported across the country. On October 29, 639 observation points recorded their coldest readings of the season, although forecasts indicated a recovery in temperatures on October 30 as rain spread across much of the nation. Meanwhile, Typhoon No. 31 is approaching the Ogasawara Islands, raising concerns about dangerously high waves and rough seas.

In other news, Japan has confirmed the well-being of a Hokkaido Shimbun newspaper reporter detained in Russia, reiterating its demand for his immediate release. The government is also planning to introduce new legislation aimed at enhancing its intelligence capabilities and preventing foreign interference. Additionally, former Prime Minister Yasuo Fukuda has passed away at the age of 90, leaving behind a legacy of significant political achievements.

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