High SeverityGovernment / Tribal Administration·January 2026

Cheyenne and Arapaho Tribes

The Cheyenne and Arapaho Tribes of Oklahoma suffered a data security incident resulting in unauthorised access to tribal member and employee personal information.

Records Affected

Undisclosed

Sector

Government / Tribal Administration

Data types exposed

NamesSocial Security NumbersDate of BirthAddressMedical Information

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Sources

Sources

This alert is based on publicly available breach notification data and reporting. If you are a representative of the affected organisation and believe any information is inaccurate, please contact us at [email protected] and we will review and update this alert promptly.

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