CVE-2026-77903 Microsoft Dataverse - Authentication Bypass

Microsoft Dataverse contains an authentication bypass caused by spoofing, letting unauthorized attackers elevate privileges over a network, exploit requires network access.

CVSS base score 9.0 /10
Critical
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.37% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Authentication Bypass
Impact
Privilege Escalation, Broken Authentication
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
Published
17 September 2026
Updated
15 October 2026
Weakness
CWE-290

Vendor fix

Update to the latest version of Microsoft Dataverse.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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