> JapanHacked_
[Investigating][Severity: Critical][Intrusion]

Sony Bank: digital securities contractor intrusion

A Sony Bank digital securities contractor leaked names and banking details for 4 customers and names for 617. The notice does not say whether these groups overlap.

Disclosed

2026-10-30

Organizations involved

1

Leaked or at risk

617

617

Downtime

Unknown

What happened

  1. A digital securities contractor noticed anomalies in its system, began investigating, identified unauthorized outside access the same day and informed Sony Bank. [1]

  2. Sony Bank disclosed that the contractor's log review had confirmed the leak. [1]

Impact

For 4 people the name, address, date of birth and account number leaked, and for 617 the name. Services other than digital securities are not affected. The contractor has not been named. [1]

Response

No fraudulent transactions and no publication or spread of the data online have been found. Affected people are being contacted individually. [1]

The notice does not specify overlap or a combined total, so these groups are not added together. [1]

Timeline

  1. Detected 2026-10-29
  2. Disclosed 2026-10-30
  3. 1 days

Attack or cause

Method
[Intrusion]
Impact
[Data leak]
Entry point
Supplier

Data exposed or at risk

[Name][Postal address][Date of birth][Bank account]

Supply chain

[Breached]

Organizations listed on this site
1

Services hit

Organizations involved

Sources

  1. [1][Official]デジタル証券に関する外部委託先への不正アクセスによるお客さま情報（氏名、住所、生年月日、口座番号：4名、氏名：617名）の漏洩についてSony Bank · 2026-10-30