On December 8, 2025, the Cheyenne and Arapaho Tribes appeared on the public leak site of the rhysida ransomware group. Internal files were allegedly exfiltrated during a ransomware attack, and the tribe’s data is now listed for anyone to download.
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What Public Reporting Shows
Public reporting indicates the Cheyenne and Arapaho Tribes, a federally recognized nation representing the Tsistsistas (Cheyenne) and Hinono’ei (Arapaho) peoples, had files stolen in a ransomware incident. The rhysida group posted the material on its leak site, claiming that internal files were exfiltrated. Exact volume and specific categories of data remain unclear from available reporting, but ransomware incidents of this type routinely expose employee records, member information, financial documents, and operational data. No confirmed victim count has been released.
Why This Matters for You and Your Family
When a government-affiliated or tribal organization is breached, the information often includes personal details that belong to ordinary people like you—tribal members, employees, contractors, and their families. A single leak can hand criminals your address, date of birth, Social Security number, or banking information. Once that data is public, it rarely disappears. Criminals combine it with other stolen records to build complete profiles. For many families this means sudden identity theft, fraudulent loans taken in their name, or tax returns filed by strangers. The breach also raises the risk that sensitive cultural or enrollment records could be misused.
The Doxxing and Identity-Chain Implications
Ransomware leaks rarely stop at one database. Attackers publish email addresses, usernames, and phone numbers that link your work identity to personal accounts. Those connections let criminals follow the trail to social-media profiles, children’s gaming accounts, and family cloud storage. A credential exposed in a tribal breach today can be reused tomorrow to take over an email account, reset banking passwords, or harass family members online. Credential leaks like this one cascade into account takeovers and doxxing chains, especially when gaming usernames tied to the same household email are involved.