Skip to content
Data Leaks Linked to Japan's My Number System Expose Millions of Emails

Data Leaks Linked to Japan's My Number System Expose Millions of Emails

First seen 12 Nov 2026, 05:19 UTC • •
API

Article Content

Browse articles
ThreatCluster AI
ThreatCluster •November 12, 2026 at 05:20 UTC
  • •A vendor breach exposed 2.2 million email addresses tied to Japan's My Number system.
  • •The Digital Agency reported a significant increase in data breach reports, totaling 2,094 in six months.
  • •Concerns arise over potential phishing attacks targeting users of the My Number card appointment services.

Japan's My Number system has not been directly breached, but significant data leaks have occurred in its ecosystem. A vendor, Arara Co., exposed approximately 2.2 million email addresses linked to My Number card appointment services. The Digital Agency reported two data leaks recently, with a surge in breach reports totaling 2,094 from April 1 to October 16, 2026. These breaches have raised concerns about the potential for phishing attacks targeting users. The Personal Information Protection Commission noted that reports involved personal information for around 260 million individuals, highlighting the extensive impact. The agency has faced two breaches itself, indicating vulnerabilities in the system's connected infrastructure.

Start a free Starter trial for enhanced analysis

Ask AI about this cluster

Updated 8h ago How this analysis works

Timeline

2026-10-16
Data breach reports surge
The Personal Information Protection Commission received 2,094 breach reports, a significant increase from previous years.
www.biometricupdate.com
2026-11-10
Email services resume
Emails associated with the My Number card appointment service resumed after the breach at Arara Co.
Pogowasright

More articles in this cluster (2)

Following this threat?

Track TKC Corporation in your own feed — you're alerted when they show up in new reporting, leak sites or exploitation.

Free account · no card needed

Extracted Entities (4)

1 / 3

Common questions

What data was leaked?
Approximately 2.2 million email addresses linked to My Number card appointment services were exposed.
How many breach reports were filed recently?
There were 2,094 breach reports filed between April 1 and October 16, 2026.
What are the risks for users?
Users may be targeted by phishing attacks due to the exposure of their email addresses.