MSRC-CVE-2026-70183 — ASP.NET Core Elevation of Privilege Vulnerability

Summary

Impact: Elevation of Privilege. Microsoft rating: Important. Not known to be exploited — Exploitation Less Likely. Customer action: Required.

Details

What privileges could be gained by an attacker who successfully exploited this vulnerability?
An attacker who successfully exploited this vulnerability could gain ELEVATED privileges, which may allow them to perform actions beyond their original permissions.

According to the CVSS metric, the attack complexity is high (AC:H). What does that mean for this vulnerability?
Successful exploitation of this vulnerability requires an attacker to win a race condition.

Security updates
17.14.42 — https://learn.microsoft.com/en-us/visualstudio/releases/2022/release-notes
10.0.13 — https://support.microsoft.com/help/5130036
8.0.32 — https://support.microsoft.com/help/5130034
9.0.21 — https://support.microsoft.com/help/5130035
18.10.4 — https://learn.microsoft.com/en-us/visualstudio/releases/2026/release-notes
11.0.0-rc.2 — https://github.com/dotnet/announcements/issues/460

Vulnerabilities 1

High 7.5

CVE-2026-70183

ASP.NET Core Elevation of Privilege Vulnerability

Concurrent execution using shared resource with improper synchronization ('race condition') in ASP.NET Core allows an authorized attacker to elevate privileges over a network.

Microsoft Microsoft Visual Studio 2022 version 17.14 Microsoft Visual Studio 2026 version 18.10 ASP.NET Core 8.0 Ubuntu Alpine Wolfi NuGet

Oct 13, 2026

Revision history

2026-10-13 #1
Information published.

References

CVE-2026-70183 ASP.NET Core Elevation of Privilege Vulnerability - HTML
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-70183
Microsoft Exploitability Index
https://www.microsoft.com/en-us/msrc/exploitability-index?rtc=1
Microsoft Support Lifecycle
https://support.microsoft.com/lifecycle
Common Vulnerability Scoring System
https://www.first.org/cvss