Microsoft disclosed on Thursday that a maximum-severity remote code execution vulnerability in Entra ID, the identity service underpinning Microsoft 365, Azure and Dynamics 365, was exploited in the wild before the company mitigated it on its own infrastructure. The flaw, tracked as CVE-2026-69836 and rated CVSS 10.0, required no authentication and no user interaction.

Entra ID, formerly Azure Active Directory, is the authentication and authorization layer for a large share of the world's enterprise cloud estates. It brokers sign-ins, conditional access decisions and token issuance across tenants, which makes any unauthenticated code execution in the service unusually consequential: an att...