GMO internet, Inc. announced a third-party unauthorized access to the Onamae.com Desktop Cloud. Affected servers number 26,739, and stored customer transactional account information may have been exposed, though payment data is not stored on these service servers. Reopening is TBD and further impacts are under investigation. 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Affected servers number 26,739, and stored customer transactional account information may have been exposed, though payment data is not stored on these service servers. Reopening is TBD and further impacts are under investigation. The company has consulted with the police and continues the investigation.","jir_summary":"### Overview of Impact and Response\nThis disclosure concerns a third-party unauthorized access affecting all plans of Onamae.com Desktop Cloud. Stored login credentials and other data for transactional accounts on the servers may have been obtained and improperly used by a third party. The incident was identified on October 20, 2026, and servers were suspended and investigations initiated from October 21 onward. The company has consulted with the police and is coordinating with relevant authorities to confirm damage and prevent further spread. The full extent of the impact remains under ongoing investigation.\n\n### Future Response and Information Provision\nAffected customers have been instructed to change authentication credentials, terminate all sessions, check transaction histories and balances, and enable two-factor authentication. Reopening timing is TBD and will be announced after safety is confirmed. Additional information will be posted on the website as it becomes available.","jir_financial_highlights":"Impact on consolidated results: Unknown (Unknown)\nNumber of affected servers: 26,739 cases (Number of potentially impacted cases)\nPossible transaction information: Login credentials for transaction accounts, etc. (Unknown)","jir_category":"","jir_hashtags":"#GMOinternet, #DisclosureUpdate, #CyberSecurity","jir_key_figures":"Affected service: Onamae.com Desktop Cloud (all plans)\nNumber of servers potentially impacted: 26,739 cases\nTypes of information: Login credentials for transactional accounts, etc. (points under investigation)","jir_meta_title":"GMO internet, Inc. - Notice Regarding Unauthorized Access to Onamae.com Desktop Cloud | Oct 2026","jir_meta_description":"GMO internet, Inc. announced an unauthorized third-party access to Onamae.com Desktop Cloud. Summary of affected server count, scope of impact, response measures, and ongoing information updates. This disclosure is not directly related to financial results.","jir_og_title":"GMO internet, Inc. Notice: Unauthorized Access to Onamae.com Desktop Cloud","jir_og_description":"Announcement of unauthorized access to Onamae.com Desktop Cloud, reporting scope and response status. Impact is under investigation and reopening timing is TBD.","jir_og_image_url":"\/assets\/og\/company-general_ir.jpg","jir_chart_data_collection":"[]","ir_related_company":8946,"ir_release_date":"","ir_type":"","ir_is_new":false,"ir_document_url":"","jir_ir_type":"disclosure_update","footnotes":""},"sector":[],"importance":[],"class_list":["post-134073","ir_release","type-ir_release","status-publish","hentry"],"yoast_head":"\n