Tokyo Tatemono vendor breach exposes personal data of up to 490 customers

• 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-account credentials overnight Nov. 9-10, 2026.
• Exposed data included contact details, registration information and LINE profile data; credit card information and passwords were not compromised.
• Sonicmoov blocked the attackers and disabled compromised credentials Nov. 10; stronger authentication and account-access restrictions are being implemented.

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 Investment Advisors 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.