Keio Plaza Hotel (hereinafter referred to as "the Company") confirmed on September 26, 2026 , that a system failure occurred due to a ransomware attack. We are currently investigating the extent of the impact, including the potential leakage of customer information. We sincerely apologize for the great inconvenience and concern this has caused everyone.
1. Background In the early hours of September 26, 2026 , we confirmed a ransomware attack on our servers. We immediately took measures to prevent further damage, including blocking external networks, and, in cooperation with Keio Corporation, we are consulting with the police and external experts to investigate the route of the ransomware attack and the extent of the damage.
2. Scope of Impact While some of our systems are experiencing difficulties, we have not confirmed any information leakage at this time. We will continue to investigate.
3. Our Response Currently, it may take longer than usual to receive a response to inquiries made through the form on our official website and through various reservation sites. Additionally, depending on the situation, we may not be able to respond to all inquiries. If any new information comes to light, we will notify you on this website. Please note that there is no impact on our hotel operations at this time.
We would like to once again sincerely apologize for the great inconvenience and concern we have caused you.
Reception Hours: 10:00 a.m. – 8:00 p.m.
The full story
This article is one source in a clustered incident — the cluster page carries the summary, timeline and every other outlet covering it.
