CyrusOne data breach
The CyrusOne breach happened on August 5, 2026 and exposed 373,460 accounts. 7 kinds of data were exposed.
Overview
- Site
- cyrusone.com
- Breach date
- August 5, 2026
- Recorded on
- October 7, 2026
- Accounts exposed
- 373,460
- Exposed data
- Email addresses, Employers, Job titles, Names, Phone numbers, Physical addresses, Support tickets
- Risk score
- 50 out of 100
Risk based on the exposed data
This breach scores 50 out of 100. The score is driven mostly by Phone numbers, Physical addresses, Email addresses.
The risk score is a guide to how dangerous a breach is, judged by the kinds of data exposed. The number of accounts is not included.
Breaches from the same period
- Fanlore (2026-08-06, 144,520 accounts)
- Chess.com (2026) (2026-08-03, 4,653,212 accounts)
- Questel (2026-08-01, 1,226,209 accounts)
What affected users should do
- Passwords were not exposed, but you may receive fake emails aimed at the exposed email addresses.
- Turn on two-factor authentication for your login.
- Phone numbers were exposed, so watch out for impersonation by text message or phone call.
This site organizes publicly available information about data breaches. Data as of October 7, 2026. Breach dates are as originally listed; when only the month is known, the date is recorded as the 1st.