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Response snapshot Oct 27, 2026, 00:06 UTC

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Disclosed incidenthibp-cyrusone

CyrusOne breach: 373,460 accounts exposed

In August 2026, data centre operator CyrusOne was the target of a ShinyHunters "pay or leak" extortion attempt .

At a glance

Sources
1 source

What to do

If you or your organization used this service, change reused passwords, watch for phishing that uses the exposed data, and check the disclosure for the organization's guidance.

Read Have I Been Pwned: CyrusOne (opens a new tab)

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.

Related technology

Sources

  1. Primary source

    Have I Been Pwned: CyrusOne (opens a new tab)

    Verified breach loaded into Have I Been Pwned: account count, exposed data types, and dates.

    Published Checked

  2. Primary source

    Have I Been Pwned breach API (opens a new tab)

    The breach list that supplied this entry.

    Published Date not suppliedChecked

Cite this record

For factual claims, cite the primary sources above; cite KEVWire for its compilation, dates, and classifications.

APA

KEVWire. (2026, October 7). CyrusOne breach: 373,460 accounts exposed. https://kevwire.com/record/hibp-cyrusone

MLA

"CyrusOne breach: 373,460 accounts exposed." KEVWire, 7 Oct. 2026, kevwire.com/record/hibp-cyrusone.

Chicago

KEVWire. "CyrusOne breach: 373,460 accounts exposed." Last modified October 7, 2026. https://kevwire.com/record/hibp-cyrusone.

Evidence summary (plain text)

CyrusOne breach: 373,460 accounts exposed (Oct 7, 2026).
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.
Sources:
Have I Been Pwned: CyrusOne: https://haveibeenpwned.com/Breach/CyrusOne
Have I Been Pwned breach API: https://haveibeenpwned.com/api/v3/breaches
Record ID: hibp-cyrusone.
Record origin: Ingested record.
AI evidence: Not assessed.
About this data

This record was ingested from a data source. Retrieved: Oct 26, 2026, 23:25 UTC. Ingestion is not an independent editorial investigation.

Verified by Have I Been Pwned. Breach date: 2026-08-05; loaded 2026-10-07. Exposed data: Email addresses, Employers, Job titles, Names, Phone numbers, Physical addresses, Support tickets. Counts are accounts in the loaded data, not necessarily distinct people.

Technology tags indicate possible relevance, not verified exposure. Confirm the affected product, version, and configuration against your own inventory; KEVWire does not scan your systems.

A personal reading checklist on this device, not verified remediation.

Record JSON

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