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

Tokio Marine X: possible unauthorized access to the contract management system

On 23 October Tokio Marine X SAST Insurance, a subsidiary of Tokio Marine & Nichido, said it found possible unauthorized access to the system that manages contract data on 21 October and has stopped related services since 22 October. Seven products are affected, including car loan repayment cover and heatstroke and influenza cover (also the docomo-branded versions); the customer portal and new applications are suspended. Claims, renewals and card premium payments continue. No leak of personal data has been confirmed so far.

Disclosed

2026-10-23

Organizations involved

1

Leaked or at risk

Unknown

Downtime

Unknown

Timeline

  1. Detected 2026-10-21
  2. Disclosed 2026-10-23
  3. 2 days

Attack or cause

Method
[Intrusion]
Impact
[Service outage]
Entry point
Unknown

Data exposed or at risk

–

Organizations involved

Open in organization search

Sources

  1. [1][Official]弊社システムにおける不正なアクセスの検知および一部サービスの一時停止についてTokio Marine X SAST Insurance · 2026-10-23
  2. [2][News]東京海上日動の子会社、サービス停止Jiji Press · 2026-10-23