company

Microsoft

American technology company

Security · 18 Oct 2026ConnectWise disables Cloud Backup service after hackers compromise Microsoft 365 tenants

ConnectWise has shut down customer access to its Cloud Backup service after hackers exploited application identities to breach Microsoft 365 tenants, giving them the ability to read emails, files, and Teams chats without triggering multi-factor authentication. Security firm Huntress reported at least 162 compromised tenants, and Microsoft confirmed it detected malicious authentication attempts from a single IP address on October 15.