---
id: CVE-2026-77903
title: >-
  Authentication bypass by spoofing in Microsoft Dataverse allows an
  unauthorized attacker to elevate privileges over a network.
summary: >-
  Authentication bypass by spoofing in Microsoft Dataverse allows an
  unauthorized attacker to elevate privileges over a network.
severity: critical
cvss: 9
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H'
cwe:
  - CWE-290
vendor: Microsoft
product: Microsoft Dataverse
affected:
  - dataverse -
published: '2026-09-17'
updated: '2026-09-19'
sourceUpdated: '2026-09-19T04:17:56.510'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-77903'
references:
  - url: 'https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-77903'
    label: secure@microsoft.com
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-09-18T14:11:57.707545Z'
epss: 0.00381
epssPercentile: 0.31834
ingestedAt: '2026-09-17T23:31:20.686Z'
---

## Overview

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

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.