CVE-2026-109481 json
ASP.NET Core Elevation of Privilege Vulnerability
published yesterday modified 16h ago also EUVD-2026-121580 , GHSA-xw2x-23jm-j582
- cvss
- 7.5
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.3%
- EPSS 0.3% chance of exploitation in 30 days, percentile 28%
- public exploits
- 0
- none known
Summary
Cross-site request forgery (csrf) in ASP.NET Core allows an unauthorized attacker to elevate privileges over a network.
Patch / fix
- nuget Microsoft.AspNetCore.App.Runtime.linux-arm 11.0.0
- nuget Microsoft.AspNetCore.App.Runtime.linux-arm64 11.0.0
- nuget Microsoft.AspNetCore.App.Runtime.linux-musl-arm 11.0.0
- nuget Microsoft.AspNetCore.App.Runtime.linux-musl-arm64 11.0.0
- nuget Microsoft.AspNetCore.App.Runtime.linux-musl-x64 11.0.0
- nuget Microsoft.AspNetCore.App.Runtime.linux-x64 11.0.0
- nuget Microsoft.AspNetCore.App.Runtime.osx-arm64 11.0.0
- nuget Microsoft.AspNetCore.App.Runtime.osx-x64 11.0.0
- nuget Microsoft.AspNetCore.App.Runtime.win-arm64 11.0.0
- nuget Microsoft.AspNetCore.App.Runtime.win-x64 11.0.0
- nuget Microsoft.AspNetCore.App.Runtime.win-x86 11.0.0
- Microsoft .NET 11.0 installed on Linux 11.0.0
- Microsoft .NET 11.0 installed on Mac OS 11.0.0
- Microsoft .NET 11.0 installed on Windows 11.0.0
Is CVE-2026-109481 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerVendor advisories
What the vendors themselves say about their products: affected, fixed or not affected, and what to do.
red hat product security vex CVE-2026-109481 updated cvss 7.5
dotnet11.0: ASP.NET Core Elevation of Privilege Vulnerability
-
Red Hat Enterprise Linux 8 dotnet, dotnet11.0, dotnet-host, dotnet-sdk-11.0, dotnet-hostfxr-11.0, dotnet-runtime-11.0, +10 more Red Hat Enterprise Linux 9 dotnet-host, dotnet-sdk-11.0, dotnet-hostfxr-11.0, dotnet-runtime-11.0, dotnet-sdk-aot-11.0, dotnet-sdk-dbg-11.0, +8 more Red Hat Enterprise Linux 10 dotnet11.0affected: no fix available
Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- total
- Assessed
- yesterday
Exploit prediction
0.35% chance of exploitation in the next 30 days, higher than 28% of all scored CVEs (FIRST EPSS, 2026-11-11).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C |
| GitHub | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C |
| CNA | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| nuget | Microsoft.AspNetCore.App.Runtime.linux-arm | >=11.0.0-preview.6.26359.118, <11.0.0 |
11.0.0 |
| nuget | Microsoft.AspNetCore.App.Runtime.linux-arm64 | >=11.0.0-preview.6.26359.118, <11.0.0 |
11.0.0 |
| nuget | Microsoft.AspNetCore.App.Runtime.linux-musl-arm | >=11.0.0-preview.6.26359.118, <11.0.0 |
11.0.0 |
| nuget | Microsoft.AspNetCore.App.Runtime.linux-musl-arm64 | >=11.0.0-preview.6.26359.118, <11.0.0 |
11.0.0 |
| nuget | Microsoft.AspNetCore.App.Runtime.linux-musl-x64 | >=11.0.0-preview.6.26359.118, <11.0.0 |
11.0.0 |
| nuget | Microsoft.AspNetCore.App.Runtime.linux-x64 | >=11.0.0-preview.6.26359.118, <11.0.0 |
11.0.0 |
| nuget | Microsoft.AspNetCore.App.Runtime.osx-arm64 | >=11.0.0-preview.6.26359.118, <11.0.0 |
11.0.0 |
| nuget | Microsoft.AspNetCore.App.Runtime.osx-x64 | >=11.0.0-preview.6.26359.118, <11.0.0 |
11.0.0 |
| nuget | Microsoft.AspNetCore.App.Runtime.win-arm64 | >=11.0.0-preview.6.26359.118, <11.0.0 |
11.0.0 |
| nuget | Microsoft.AspNetCore.App.Runtime.win-x64 | >=11.0.0-preview.6.26359.118, <11.0.0 |
11.0.0 |
| nuget | Microsoft.AspNetCore.App.Runtime.win-x86 | >=11.0.0-preview.6.26359.118, <11.0.0 |
11.0.0 |
Affected products
- Microsoft .NET 11.0 installed on Linux
- Microsoft .NET 11.0 installed on Mac OS
- Microsoft .NET 11.0 installed on Windows
- Microsoft Microsoft Visual Studio 2026 version 18.12
Classification
- Weakness
-
- CWE-352 Cross-Site Request Forgery
References
-
msrc.microsoft.com
/update-guide/vulnerability/CVE-2026-109481
vendor-advisory, patch, web
-
github.com
/dotnet/aspnetcore/security/advisories/GHSA-xw2x-23jm-j582
web
-
nvd.nist.gov
/vuln/detail/CVE-2026-109481
advisory
-
github.com
/dotnet/announcements/issues/506
web
-
github.com
/dotnet/aspnetcore
package
-
github.com
/dotnet/aspnetcore/discussions/70470
web
-
github.com
/dotnet/aspnetcore/releases/tag/v11.0.0
web
-
github.com
/dotnet/core/blob/main/release-notes/11.0/11.0.0/11.0.0.md
web
Sources
- CVE List CVE-2026-109481
- GitHub Advisory GHSA-xw2x-23jm-j582
- NVD CVE-2026-109481
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.