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Arcadia
Japan1 source
Confirmed:Confirmed by the organisation, a regulator or a securities filing. First reported 8 Nov 2026.
Arcadia disaster-alert system misused for phishing emails
Japan's Arcadia disaster-alert system was misused to send 1.4 million phishing emails. The incident was reported on 8 November 2026.
- Type
- Cyberattack
- Sector
- Technology
- First reported
- 8 Nov 2026
- Latest source
- 8 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 Arcadia
Sources
1Confidence 55% that this is real and correctly placed. Locations are city centroids at best. Spotted an error? Report a correction.