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CVE-2026-70179ImportantEoPNetwork

ASP.NET Core Elevation of Privilege Vulnerability

MSRC advisory NVD CVE.org

Assessment

Authentication bypass by spoofing in ASP.NET Core allows an authorized attacker to elevate privileges over a network.

Severity
Important
CVSS base score
7.5CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
Impact
Elevation of Privilege
EPSS, next 30 days
Not scored yet
Public exploit code
No Nuclei template lists it
Exploitability
Exploitation Less Likely
Publicly disclosed
No
Customer action
Required: apply the update
Component
ASP.NET Core
Weakness
CWE-290: Authentication Bypass by Spoofing
Issued by
Microsoft
Published
13 Oct 2026 · October 2026
Last revised
13 Oct 2026
CVSS 3.1 base metricsRed raises the risk · green lowers it
Attack vector
NetworkAV:N
Attack complexity
HighAC:H
Privileges required
LowPR:L
User interaction
NoneUI:N
Scope
UnchangedS:U
Confidentiality
HighC:H
Integrity
HighI:H
Availability
HighA:H

Updates that fix it

0 KBs

No KB listed

MSRC lists no downloadable update, which usually means a service-side fix or a release-notes update. Check the MSRC advisory.

Affected products

Developer Tools, Other
11 affected products
  • Microsoft Visual Studio 2022 version 17.14
  • Microsoft Visual Studio 2026 version 18.10
  • Microsoft.AspNetCore.Authentication.Negotiate on .NET 10.0 installed on Linux
  • Microsoft.AspNetCore.Authentication.Negotiate on .NET 10.0 installed on Mac OS
  • Microsoft.AspNetCore.Authentication.Negotiate on .NET 10.0 installed on Windows
  • Microsoft.AspNetCore.Authentication.Negotiate on .NET 8.0 installed on Linux
  • Microsoft.AspNetCore.Authentication.Negotiate on .NET 8.0 installed on Mac OS
  • Microsoft.AspNetCore.Authentication.Negotiate on .NET 8.0 installed on Windows
  • Microsoft.AspNetCore.Authentication.Negotiate on .NET 9.0 installed on Linux
  • Microsoft.AspNetCore.Authentication.Negotiate on .NET 9.0 installed on Mac OS
  • Microsoft.AspNetCore.Authentication.Negotiate on .NET 9.0 installed on Windows

What changed

First observed 14 Oct 2026

No field changes in the recorded history.

Cite this recorded revision to keep the same title, summary, facts and links when the page changes.

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ChangeIntel

An IT change radar: releases, security, known issues, retirements, documentation changes, and service status from public sources. Every item links to supporting evidence; dates and statuses can change after they are read.

Sources read 14 Oct 12:55 UTC · 254 of 255 readable · 253 fully read · documentation 0/409 current

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