ReportedReported by fewer than three independent publishers, with no official finding.
Oklahoma Cheyenne and Arapaho Tribes say ransomware disrupted tribal systems
The Cheyenne and Arapaho Tribes of Oklahoma say a ransomware attack forced them to shut down tribal computer networks, disrupting email and phone service and temporarily suspending some operations as systems are...
DII-2026-000424 sources ↓
What happened
Not publicly disclosed.
Classification
Sources and evidence
This record was researched and written by the Index, based on the following original reporting.
DataBreaches.net
Oklahoma Cheyenne and Arapaho Tribes say ransomware disrupted tribal systems
18 February 2026