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Breach occurred 2026-08-05Verifiedcyrusone.com
What happened
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.
Data exposed
Frequently asked questions
The CyrusOne data breach occurred on August 5, 2026. It was added to Have I Been Pwned's breach catalog on October 7, 2026.
373,460 accounts were affected by the CyrusOne data breach, according to Have I Been Pwned's records.
The CyrusOne breach exposed the following data types: Email addresses, Employers, Job titles, Names, Phone numbers, Physical addresses, Support tickets.
Yes. Have I Been Pwned has verified the CyrusOne breach, meaning there's confirmed evidence the exposed data is genuine and tied to real accounts.
Use KazaSec's free Email Breach Checker (/tools/breach-check) to check whether a specific email address has surfaced in the CyrusOne breach, or any other known breach, the tool never stores what you search.
Our free Email Breach Checker tells you whether a specific email address has surfaced in this breach, or any other known breach, without ever storing what you search.
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