---
title: "Data breach at Daiwa Securities"
description: "On 5 October 2026, Daiwa Securities, Japan's second-largest brokerage, announced that the servers of an external vendor, Scala Communications, had been accessed without authorisation. The vendor informed Daiwa on Saturday 3 October. Information on up to 110,000 clients may have been leaked, includin"
canonical: https://inyourgeek.com/en/fuites-de-donnees/2026-10-05-daiwa-securities
type: fuite-de-donnees
author: "Sébastien Soulier"
publisher: "InYourGeek"
language: en
datePublished: 2026-10-05
dateModified: 2026-10-05
---
# Daiwa Securities

Data breach — Low

On 5 October 2026, Daiwa Securities, Japan's second-largest brokerage, announced that the servers of an external vendor, Scala Communications, had been accessed without authorisation. The vendor informed Daiwa on Saturday 3 October. Information on up to 110,000 clients may have been leaked, including names and account numbers. Daiwa states that its own systems were not breached and that no improper transactions linked to the leak have been detected.

According to Daiwa, the exposed data cannot be used to access securities accounts or to trade online.

| Fact | Value |
| --- | --- |
| Disclosed on | October 5, 2026 |
| Accounts affected | 110,000 |
| Sector | Banking and finance |
| Country | Japan |
| Cause | Third-party provider |
| Severity | Low |
| Status | Reported |

## Exposed data

- Full name
- Customer ID

## What you can do

- You can ask the organisation exactly what was exposed about you (right of access), and complain to the DPA if no answer comes within a month.

## Sources

- [Daiwa Securities says info on 110,000 clients may have been leaked in vendor incident](https://databreaches.net/2026/10/05/daiwa-securities-says-info-on-110000-clients-may-have-been-leaked-in-vendor-incident/) — DataBreaches.net

_Entry built from the cited sources after a corroboration check, then reviewed before publication._

---

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