Advisory: Azure CLI Password-Spray Account Takeover
Attackers are spraying passwords from old breaches at Microsoft 365 accounts through the Azure command-line client (Azure CLI), whose password-only sign-in never shows an MFA prompt. Huntress reported one campaign that made more than 81 million sign-in attempts in two weeks of June 2026 and compromised 78 accounts at 64 organizations.
Any organization whose MFA policy leaves gaps (some users, some apps, trusted locations, report-only mode) is exposed. MSSPs should check every tenant they manage. On October 23, 2026, Fluency released to every instance a detection for the takeover that follows a blocked attempt. No action is needed to turn it on.