A ransomware group calling itself ShinyHunters claims to have carried out an attack against CyrusOne, LLC., with the claim dated August 23, 2026. This claim comes from an entry on the group’s own leak-site listing, which is tracked and archived by ransomware.live, a security research platform that monitors ransomware groups’ public extortion sites. CyrusOne, LLC. has not confirmed this claim, and no regulator or independent authority has verified it. At this stage, it is an unverified assertion made by a criminal group, not an established fact.
What we know — and don’t
- A group calling itself ShinyHunters listed CyrusOne, LLC. on its leak site, with a claimed date of August 23, 2026.
- CyrusOne, LLC. operates in the ‘other’ sector category as classified for this report; its business activities may involve infrastructure or facilities services, but details relevant to this claim are not confirmed.
- The specific data types the group claims to have obtained have not been disclosed publicly and have not been confirmed by CyrusOne, LLC. or any independent party.
- No official statement from CyrusOne, LLC. confirming or denying the incident has been identified at this time.
- No regulatory filing or breach notification tied to this claim has been reported as of this writing.
What should you do if you have an account with this company?
- Change your password for any account associated with CyrusOne, LLC., and avoid reusing that password on other sites.
- Enable two-factor authentication (2FA) wherever it is offered, preferably using an authenticator app rather than SMS.
- Be alert to phishing emails, texts, or calls that reference this company, especially messages urging urgent action or requesting login credentials.
- Monitor your financial statements and credit reports for unfamiliar activity in the coming weeks and months.
- Consider signing up for an identity monitoring service like a service like Aura or LifeLock to get alerted if your personal information surfaces in unexpected places.
- Avoid clicking links in unsolicited messages and instead navigate directly to the company’s official website if you need to verify your account status.
BreachLetter will update this page if CyrusOne, LLC. confirms this incident, issues a public statement, or if the matter is officially reported to regulators.