CyrusOne Data Breach History
WebsiteCyrusOne is a US data-center operator with roughly 50 facilities serving enterprise and hyperscale customers, backed by KKR and Global Infrastructure Partners.
This page shows all data breaches of CyrusOne. View the complete breach timeline, records exposed, root causes, and AI breach risk score. BreachHistory tracks disclosed data breaches worldwide.
Data Breach Timeline — All CyrusOne Breaches
CyrusOne Data Breach Summary
This page tracks the CyrusOne data breach history and cybersecurity incidents affecting CyrusOne (United States). BreachHistory currently indexes 1 publicly disclosed or catalogued incident spanning 2026, with approximately 12.9 million records reported as exposed across all indexed events. These totals may include overlapping datasets or third-party estimates and should not be interpreted as unique affected users.
The CyrusOne breach timeline includes major data breaches, cyber attacks, data leaks, credential exposures, API abuse, and other security incidents. Each incident provides details on the estimated records exposed, attack method, affected data types, and supporting public sources. Currently, 0 incidents are company-confirmed, while 1 remain unverified claims pending independent verification.
Largest CyrusOne Data Breaches
The largest indexed incidents include the 2026 CyrusOne — ShinyHunters leak-site claim; ~12.9M Salesforce records + facility…. Record counts originating from threat actors or leak sites should be treated as estimates unless confirmed by CyrusOne or a regulator. Below is the list of large data breaches:
- 2026 2026 CyrusOne — ShinyHunters leak-site claim; ~12.9M Salesforce records + facility docs (unverified) — about 12.9M records exposed · Unverified claim
What Information Was Exposed?
Depending on the incident, exposed data may include passwords and login credentials, and other personal information (PII). The exact data varies between incidents, so review each breach page before assuming your information was affected.
CyrusOne Data Breach 2026
At the time of this update, BreachHistory catalogues 1 2026 incident related to CyrusOne. Most recent entry: 2026 CyrusOne — ShinyHunters leak-site claim; ~12.9M Salesforce records + facility docs (unverified). New incidents are added as official disclosures, regulatory filings, or credible cybersecurity reports become available.
What To Do If You Were Affected
If you believe your account may have been involved in a CyrusOne data breach, change any reused passwords, enable multi-factor authentication (MFA), monitor your account for suspicious activity, and be cautious of phishing emails or fake breach notifications.
This CyrusOne breach history is maintained by BreachHistory using public disclosures, regulatory filings, security research, and clearly labelled third-party claims. For the complete breach timeline, records exposed, incident details, and AI Breach Risk Score, explore the sections on this page.