CVE-2026-70179

ASP.NET Core Elevation of Privilege Vulnerability

State: Published
Severity: 7.5 High
Published: Oct 13, 2026
Updated: Oct 31, 2026
Reserved: Aug 3, 2026

Description

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

Scores

CVSS	Score	Vector	Source
3.1	7.5 High	CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C	microsoft

Weaknesses

CWE-290 Authentication Bypass by Spoofing

Affected Products

Product	Versions
Microsoft Visual Studio 2022 version 17.14Microsoft	17.14.0 to before 17.14.42Affected
Microsoft Visual Studio 2026 version 18.10Microsoft	18.10.0 to before 18.10.4Affected
Microsoft.AspNetCore.Authentication.NegotiateMicrosoft	10.0.0 to before 10.0.13Affected

References

ASP.NET Core Elevation of Privilege Vulnerabilityvendor-advisorypatch

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