CyrusOne data breach (2026-08-05) — 373,460 accounts
In August 2026, data centre operator CyrusOne was the target of a ShinyHunters "pay or leak" extortion attempt. The group subsequently published data allegedly obtained from the company, which included 373k unique email addresses across records relating to users, sales leads and CyrusOne employees. The data largely consisted of corporate contact information, including names, physical addresses, phone numbers and job titles. It also included support tickets and other information related to the organisation's operations.
- Published by source
- 2026-10-07
- First seen by Reality Radar
- 2026-10-20
- Last verified
- 2026-10-20
Affected
- Manufacturer
- CyrusOne
- Products
- CyrusOne
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Sources
- Have I Been Pwned — breach catalogue Tier B published 2026-10-07
Evidence ledger
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