八十二長野銀行 announced that a third party had gained unauthorised access to an employee’s email account. The potentially leaked information consists of the email addresses of 35 customers and others. The incident occurred on the 7th, and was identified and announced on the 8th.
八十二長野銀行 announced that a third party had gained unauthorised access to an employee’s email account, following a suspicious external email received by the employee. The incident occurred on 7 October 2026 and was identified on 8 October 2026. It is currently investigating whether the third party viewed or obtained information contained in the email.
The potentially leaked information includes the email addresses of 35 customers and others. The bank has not confirmed the leakage of any other information at this time and is investigating the scope of the impact with an external specialist provider. Further reports are awaited on the specific details and number of affected records.
After the incident was identified, access to the relevant email account was blocked and the affected individuals were contacted individually. The bank says that an investigation by an external specialist provider has been conducted and the relevant authorities have been notified. No damage, including unauthorised use, has been publicly confirmed at this time.
As measures to prevent a recurrence, the bank is considering containment and prevention of re-entry separately. Specific measures listed include locking down the account, strengthening authentication, monitoring the mailbox, conducting a thorough investigation into the scope of the impact, and conducting reporting drills. The point of contact is the Customer Consultation Office.