CyrusOne data breach
373,460 accounts exposed.
Check whether your email is included on Have I Been Pwned.
What was exposed
Email addressesEmployersJob titlesNamesPhone numbersPhysical addressesSupport tickets
What to do
- Expect more phishing emails that mention this service. Do not click links in them; go to the site directly.
- Be wary of texts and calls that seem to know your details.
- Turn on two-step verification wherever it is offered, and use a password manager.
About this breach
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.