CVE-2026-69843

CVE-2026-69843 is an authentication bypass by spoofing flaw (CWE-290) in Microsoft Fabric, Microsoft's cloud analytics platform. An unauthenticated remote attacker can trigger it by sending spoofed network requests that impersonate a legitimate trusted identity or endpoint, requiring no user interaction or credentials. Successful exploitation grants the attacker elevated privileges over the network, with the scope-changed CVSS vector indicating potential high impact to confidentiality, integrity, and availability beyond the vulnerable component. Any organization using Microsoft Fabric is in the affected population. As of this writing there is no known in-the-wild exploitation, no CISA KEV listing, and no public proof-of-concept.

What to do: Confirm your Microsoft 365/Fabric tenant has received Microsoft's remediation (cloud components are patched by Microsoft, but any customer-hosted components such as data gateways must be updated per Microsoft's advisory). Review Fabric/Microsoft Entra sign-in and audit logs for anomalous access or unexpected privilege elevation, and rotate credentials for privileged service accounts. Restrict network paths into Fabric-connected resources and follow Microsoft's advisory for additional mitigations.