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Securitize Japan
Japan1 source
Confirmed:Confirmed by the organisation, a regulator or a securities filing. First reported 4 Nov 2026.
Securitize Japan breach exposes Sony Bank and NTT Data data
A cyberattack on Securitize Japan exposed customer data held by Sony Bank, NTT Data and Marui Group, which all acknowledged the breach. Attackers exploited a platform authentication flaw to gain administrator rights and steal data.
- Type
- Cyberattack
- Sector
- Finance
- First reported
- 4 Nov 2026
- Latest source
- 4 Nov 2026
What to do
- Follow updates from the organisation itself rather than social media.
- If you have an account, change that password, and anywhere you reused it.
- Turn on two-factor authentication, ideally an authenticator app or passkey, not SMS.
- Expect phishing that uses your real details. Do not click links in messages about this incident; go to the company's site directly.
- If they are a supplier, ask for an incident summary and the indicators of compromise.
- Patch internet-facing systems first, especially VPNs, firewalls and file transfer software.
Not sure? Ask an assistant with the sources attached, or have a coding agent check your systems.
Check your systems for Securitize Japan
Sources
1Confidence 55% that this is real and correctly placed. Locations are city centroids at best. Spotted an error? Report a correction.