CVE-2026-77903

Critical CVSS 9

Published 2026-09-17 · last changed 2026-09-19

The fix

We hold no Microsoft remediation data for CVE-2026-77903, which normally means it is not a Windows CVE. For non-Microsoft software the fix is the vendor's own updated release, and the affected versions are listed below.

What it is

Authentication bypass by spoofing in Microsoft Dataverse allows an unauthorized attacker to elevate privileges over a network.

Sources

NVD record for CVE-2026-77903

CVSS vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H