• Tokyo Tatemono suffered a personal data breach affecting up to 490 registered users of its Nihonbashi Building workers' LINE account.
• Attackers accessed contractor Sonicmoov's COMSBI system using compromised support credentials overnight Nov. 9-10, 2026, obtaining information from multiple organizations.
• Exposed records included contact details, membership information and LINE profile data; credit card information and passwords were not compromised.
• Sonicmoov blocked the attackers' access on Nov. 10 and disabled the compromised credentials.
• The contractor is strengthening authentication and access controls; the property developer is tightening contractor oversight.

Disclaimer: This news brief was created by Public Technologies (PUBT) using generative artificial intelligence. While PUBT strives to provide accurate and timely information, this AI-generated content is for informational purposes only and should not be interpreted as financial, investment, or legal advice. Tokyo Tatemono Co. Ltd. published the original content used to generate this news brief on November 13, 2026, and is solely responsible for the information contained therein.