
ConnectWise shuts backup service after stolen credential opens Microsoft 365 tenants
Hundreds of sign-ins confirmed; restoration timeline still unannounced as defenders hunt for planted backdoor credentials
ConnectWise has suspended its Cloud Backup service, formerly SkyKick, along with the linked SaaS Security and Cloud Management products. The suspension followed the theft of an API secret tied to its Microsoft 365 integration. Because the app is multi-tenant, whoever held the secret could request access tokens in customer tenants without a password or an MFA prompt. Huntress reported unauthorized sign-ins in 162 tenants. It also said nearly 1,000 sign-in attempts against its own customers led to about 300 successes. In at least one tenant, a ConnectWise app gave itself Global Administrator rights and added credentials to other apps. Those credentials survive the shutdown unless defenders remove them. ConnectWise says it has seen no successful threat activity since mitigation began on October 17 and has no evidence the encrypted archives were touched. It has not said how the secret was stolen, who is responsible, or when service will return.
Why it mattersA single vendor credential gave an attacker standing access across many managed-service-provider customers, and the cleanup falls to each customer.












