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Data breach

Sompo Japan contractor breach may have exposed 65,000 policyholder records

First reported · Last reported · 8 related reports

SpilloverSpillover from the GMO Internet incident · View original incident →

Unauthorized access to a contractor of Sompo Japan Insurance raised concerns that approximately 65,000 policyholder records may have been exposed. The possible leak was disclosed on November 5, while whether any data was actually leaked and the specific response measures remained unconfirmed.

Key facts

Affected organization
Sompo Japan Insurance
Original incident
GMO Internet cloud breach leaks customer data and causes trading losses
Incident type
Data breach
Occurred / detected
Not confirmed
Scale of damage
Possible exposure of approximately 65,000 policyholder records
Cause / method
Unauthorized access to a contractor
Location
Japan

If your data was exposed

  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. The possible exposure of approximately 65,000 policyholder records following unauthorized access to a contractor of Sompo Japan Insurance was disclosed.

Original incident

This is spillover from the GMO Internet incident.

  • RansomwareGMO InternetKnock-on victims: 1

    GMO Internet cloud breach leaks customer data and causes trading losses

    Impact: Up to 26,739 servers affected; loss compensation claims totaling 2.99 billion yen for 2,943 accounts

    GMO Internet's Onamae.com Desktop Cloud suffered a malware attack that affected up to 26,739 servers, resulting in customer data leaks and asset losses from unauthorized trades. The company advised customers to shut down their PCs and offered a bounty to track down the attackers, while acknowledging that it had not adequately responded to earlier warnings about security vulnerabilities. By November 12, claims for loss compensation totaling 2.99 billion yen had been submitted for 2,943 accounts, while the final loss amount remained undetermined.

    Related reports: 70 · last report →

8 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.