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Data breach

Arara email service breach exposes up to 2.23 million TKC user email addresses

First reported · Last reported · 1 related reports

SpilloverSpillover from the Arara incident · View original incident →

Additional disclosures revealed that up to 2,230,812 email addresses belonging to users of TKC-operated systems were exposed through a breach of Arara’s email service. Investigators are examining whether information belonging to users of municipal online application services, including those in Yokohama and Kawasaki, was also affected.

Key facts

Affected organization
TKC
Original incident
Arara email service hack exposes 81.33 million email addresses
Incident type
Data breach
Occurred / detected
Not confirmed
Scale of damage
Up to 2,230,812 user email addresses
Cause / method
Breach of Arara’s email service
Location
Japan

If your data was exposed

Exposed dataEmail

  1. Don’t tap links in texts, calls or emails that mention this incident and offer compensation, refunds or breach checks. Check directly on the organization’s official website or app.

Timeline

  1. Additional disclosures revealed the exposure of up to 2,230,812 email addresses belonging to users of TKC-operated systems.

Original incident

This is spillover from the Arara incident.

  • Data breachAraraKnock-on victims: 25

    Arara email service hack exposes 81.33 million email addresses

    81.3MImpact: 81,329,467 email addresses and some customers' member information

    Japan's Arara Message email delivery service was breached through a web server vulnerability, exposing email addresses and some customers' member information. Further investigation put the number of unique email addresses exposed at 81,329,467. The attacker also abused the service to send up to approximately 7.13 million emails impersonating credit card companies, and the company isolated the servers and completely suspended its email delivery service.

    Related reports: 20 · last report →

1 related reports

The summary and key facts are written by AI from related reports and may contain errors. Check the original articles and the organization’s official statements for accurate details.