Bandai Namco reports leak of 346,247 email addresses from THE GUNDAM BASE MEMBERS

Bandai Namco Entertainment and BANDAI SPIRITS announced on October 26, 2026, that email addresses and other information belonging to users of THE GUNDAM BASE MEMBERS were leaked following unauthorized access to an outsourced provider's environment. The compromised data covers 346,247 email addresses registered with the service and internal identifiers used for Bandai Namco ID management.

According to gamespark.jp, the companies said names, addresses, purchase history, login passwords and credit card information were not included in the leak. The email delivery service for THE GUNDAM BASE MEMBERS was suspended immediately after the unauthorized access was detected, while Bandai Namco ID and THE GUNDAM BASE MEMBERS services remain usable.

The companies reported the matter to Japan's Personal Information Protection Commission and are investigating the cause and scope of the incident together with Yumirlink, the outsourced email service provider. No secondary damage from the incident has been confirmed so far, but users are being warned about possible spoofing and phishing emails.

Earlier report from provider

Yumirlink had reported to Bandai Namco Entertainment on October 26 that there were traces of unauthorized access to THE GUNDAM BASE MEMBERS environment within the Bandai Namco ID email service and that email address information had been obtained.