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ConnectWise Cloud Backup Credential Abuse: 173 M365 Tenants Compromised in Trust-Through-Defaults Incident

ConnectWise Cloud Backup Credential Abuse: 173 M365 Tenants Compromised in Trust-Through-Defaults Incident

Threat actors weaponized a vendor-managed credential in ConnectWise Cloud Backup to authenticate across 173 Microsoft 365 tenants on October 15, 2026. The credential lived in ConnectWise’s own tenant. Customer-side defenses – multi-factor authentication, conditional access, session controls – could not touch it. This is the tenth trust-through-defaults incident on this desk since September 26. The […]

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