Description
Improper verification of cryptographic signature in ASP.NET Core allows an unauthorized attacker to elevate privileges over a network.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Microsoft | ASP.NET Core 10.0 | 10.0 – < 10.0.7 | 10.0.7 |
| Microsoft | Microsoft Visual Studio 2026 version 18.5 | 18.5.0 – < 18.5.2 | 18.5.2 |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.04 LTS | dotnet10 | 10.0.107-10.0.7-0ubuntu1~26.04.1 | — |
| Ubuntu 25.10 | dotnet10 | 10.0.107-10.0.7-0ubuntu1~25.10.1 | — |
| Ubuntu 24.04 LTS | dotnet10 | 10.0.107-10.0.7-0ubuntu1~24.04.1 | — |
| Ubuntu 22.04 LTS | dotnet7 | No fix yet | — |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | dotnet10-runtime | 10.0.7-r0 | — |
| Alpine v3.23 | dotnet10-runtime | 10.0.7-r0 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | dotnet +5 | 10.0.107-1.amzn2023.0.1 | ALAS2023-2026-1634 |
| Amazon Linux 2023 | dotnet-host +8 | 10.0.7-1.amzn2023.0.1 | ALAS2023-2026-1634 |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| NuGet | Microsoft.AspNetCore.DataProtection | >= 10.0.0, < 10.0.7 | 10.0.7 | GHSA-9mv3-2cwr-p262 |
Advisories 4
- WID-SEC-2026-1213 Microsoft ASP.NET: Schwachstelle ermöglicht Privilegieneskalation BSI CERT-Bund (WID) · May 3, 2026
- ALAS2023-2026-1634 Important: dotnet10.0 security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Apr 30, 2026
- MSRC-CVE-2026-40372 ASP.NET Core Elevation of Privilege Vulnerability Microsoft Security Response Center · Apr 28, 2026
- NCSC-2026-0123 Kwetsbaarheid verholpen in ASP.NET Core van Microsoft NCSC-NL (Netherlands) · Apr 22, 2026
References
- ASP.NET Core Elevation of Privilege Vulnerability vendor-advisory patch