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Ransomware Attack Disrupts Cheyenne and Arapaho Tribes' Operations

First seen 19 Feb 2026, 16:18 UTC • Databreaches

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The Cheyenne and Arapaho Tribes in Oklahoma experienced a ransomware attack that forced the shutdown of tribal computer networks, disrupting email and phone services. The attack has led to the temporary suspension of some operations as systems are being restored and investigations are underway.

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2026-02-18

Ransomware attack disrupts tribal systems and services

2026-02-19

Tribal government reports extortion by ransomware gang

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Ransomware Attack Disrupts Cheyenne and Arapaho Tribes' Operations

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