Mizuho Bank: Up to 5,483 banking customers may be affected

Mizuho Bank: Up to 5,483 banking customers may be affected

Mizuho Bank: Up to 5,483 Banking Customers May Be Affected by Data Incident
February 26, 2026

Mizuho Bank has reported that up to 5,483 customers may have been impacted by an incident involving the inadvertent disclosure of personal information. According to internal records, the bank mistakenly shared customer data with third-party entities during routine administrative processes. The affected information includes names, account numbers, and contact details, though no evidence of financial loss or identity theft has been confirmed at this stage. The bank has notified impacted customers and regulatory authorities, offering complimentary credit monitoring services as a precautionary measure.

This incident follows recent cybersecurity challenges, including a surge in phishing scams targeting Mizuho Bank clients. The bank has issued warnings about fraudulent emails impersonating its services, which direct users to spoof websites to harvest sensitive data such as login credentials and credit card numbers. While no verified cases of customer compromise have been reported, Mizuho emphasizes that these scams remain an active threat.

Mizuho Bank has reiterated its commitment to safeguarding client data, stating that it has strengthened internal protocols to prevent future breaches. The bank advises customers to verify the authenticity of unsolicited communications and avoid clicking links in suspicious emails. Official websites, including those for online banking and lottery services, remain secure channels for transactions.

The incident underscores broader risks in the financial sector, where data privacy and cybersecurity remain critical concerns. Investors and stakeholders are urged to monitor Mizuho Bank's ongoing response, including updates on customer support measures and regulatory compliance efforts. As of now, the bank has not disclosed material financial impacts from the incident.

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