The breach was identified by security researchers on October 17, as they tracked the misuse of credentials across numerous organizations. The incident highlights a systemic supply-chain risk where a single compromised account at a service provider can expose hundreds of downstream clients who rely on that provider's backup and management tools.
Tuesday, October 20, 2026
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Hackers Breach 173 Microsoft 365 Tenants via ConnectWise Attack
Cybersecurity3 days ago
Unauthorized actors leveraged stolen vendor credentials to bypass security perimeters and infiltrate enterprise cloud environments. Attackers used a compromised ConnectWise Cloud Backup credential to access 173 Microsoft 365 customer and partner tenants in a supply-chain attack, allowing them to enter systems by exploiting the trusted relationship between the tenants and the third-party service.
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