CyrusOne Data Breach (August 2026)
cyrusone.com
About This Breach
CyrusOne, a data centre operator, was allegedly breached by the ShinyHunters group in August 2026, with data later published online exposing 373k unique email addresses along with names, physical addresses, phone numbers, job titles, support tickets, and operational information relating to users, sales leads, and employees.
Data Exposed
Breach Details
| Breach Type | Data Breach |
| Searchable | Yes |
| Verified | Yes |
| Sensitive Data | No |
| Reference | No reference available |
Frequently Asked Questions
How do I check if I was in the CyrusOne breach?
Type your email address into the search box on our data breach check page. If it appears in the CyrusOne breach, or any other, you'll see the breach name, date and what was exposed. It's free and nothing you type is stored.
When did the CyrusOne data breach happen?
CyrusOne was breached in Aug 2026. The breach was added to the XposedOrNot index on November 14, 2026.
How many records were exposed in the CyrusOne breach?
357,752 records were exposed, making it the #579 largest of the 800 breaches in our index.
What data was exposed in the CyrusOne breach?
The exposed data includes: Email addresses, Names, Phone numbers, Physical addresses, Employers, Job titles.
What should I do if I was affected by the CyrusOne breach?
No password was in this breach, so the main risk is phishing. Be wary of emails, calls or texts that quote these details, turn on two-factor authentication, and set up free breach alerts on XposedOrNot so you know the moment your email appears in a new breach.
More Information Technology Breaches
What Should You Do?
Enable Two-Factor Authentication
Add 2FA on all supported accounts using an authenticator app like Google Authenticator or Authy.
Watch for Phishing Calls & SMS
Be cautious of unexpected calls or texts asking for personal information.
Beware of Scam Mail
Be skeptical of unexpected correspondence requesting personal details.
Monitor Your Accounts
Set up login alerts and review account activity regularly for suspicious access.
For companies: check how many addresses on your domain appear in breaches (opens in new tab), free.