Origin validation error in .NET lets attackers disclose information
Priority LOW 24CWE-346Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- Required
- Attack complexity
- High
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- High · None · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-346.
Summary
Microsoft .NET 10.0 runtime, .NET 11.0 runtime, .NET 8.0 runtime, .NET 9.0 runtime, Visual Studio 2022 version 17.14 and other products are affected. An origin validation error (CWE-346) lets an unauthorized attacker disclose information over a network. The attacker needs no privileges, but the attack requires user interaction and a high-complexity condition, and it gives high confidentiality impact.
Written with Claude Haiku 5.5 from the sources below · 2026-10-28
Description from the CNA
Origin validation error in .NET allows an unauthorized attacker to disclose information over a network.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00328 26th percentileScored 2026-11-07
Fix Fixed .NET 10.0 runtime (Microsoft): 10.0.13.NET 11.0 runtime (Microsoft): 11.0.0-rc.2+7 more productsRed Hat: 1 advisory
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Microsoft | .NET 10.0 runtime | 10.0.0 to before 10.0.13 | 10.0.13 | Patch available | CNA |
| Microsoft | .NET 11.0 runtime | 11.0.0 to before 11.0.0-rc.2 | 11.0.0-rc.2 | Patch available | CNA |
| Microsoft | .NET 8.0 runtime | 8.0.0 to before 8.0.32 | 8.0.32 | Patch available | CNA |
| Microsoft | .NET 9.0 runtime | 9.0.0 to before 9.0.21 | 9.0.21 | Patch available | CNA |
| Microsoft | Microsoft Visual Studio 2022 version 17.14 | 17.14.0 to before 17.14.42 | 17.14.42 | Patch available | CNA |
| Microsoft | Microsoft Visual Studio 2026 version 18.10 | 18.10.0 to before 18.10.4 | 18.10.4 | Patch available | CNA |
| — | Microsoft.WindowsDesktop.App.Runtime.win-arm64 (NuGet) | 9.0.0 to before 9.0.21 | 9.0.21 | Patch available | GHSA-fq6x-pvr9-888r |
| — | Microsoft.WindowsDesktop.App.Runtime.win-x64 (NuGet) | 9.0.0 to before 9.0.21 | 9.0.21 | Patch available | GHSA-fq6x-pvr9-888r |
| — | Microsoft.WindowsDesktop.App.Runtime.win-x86 (NuGet) | 9.0.0 to before 9.0.21 | 9.0.21 | Patch available | GHSA-fq6x-pvr9-888r |
| — | Microsoft.WindowsDesktop.App.Runtime.win-arm64 (NuGet) | 10.0.0 to before 10.0.13 | 10.0.13 | Patch available | GHSA-fq6x-pvr9-888r |
| — | Microsoft.WindowsDesktop.App.Runtime.win-x64 (NuGet) | 10.0.0 to before 10.0.13 | 10.0.13 | Patch available | GHSA-fq6x-pvr9-888r |
| — | Microsoft.WindowsDesktop.App.Runtime.win-x86 (NuGet) | 10.0.0 to before 10.0.13 | 10.0.13 | Patch available | GHSA-fq6x-pvr9-888r |
| — | Microsoft.WindowsDesktop.App.Runtime.win-arm64 (NuGet) | 8.0.0 to before 8.0.32 | 8.0.32 | Patch available | GHSA-fq6x-pvr9-888r |
| — | Microsoft.WindowsDesktop.App.Runtime.win-x64 (NuGet) | 8.0.0 to before 8.0.32 | 8.0.32 | Patch available | GHSA-fq6x-pvr9-888r |
| — | Microsoft.WindowsDesktop.App.Runtime.win-x86 (NuGet) | 8.0.0 to before 8.0.32 | 8.0.32 | Patch available | GHSA-fq6x-pvr9-888r |
| — | Microsoft.WindowsDesktop.App.Runtime.win-arm64 (NuGet) | 11.0.0-preview.1 to before 11.0.0-rc.2 | 11.0.0-rc.2 | Patch available | GHSA-fq6x-pvr9-888r |
| — | Microsoft.WindowsDesktop.App.Runtime.win-x64 (NuGet) | 11.0.0-preview.1 to before 11.0.0-rc.2 | 11.0.0-rc.2 | Patch available | GHSA-fq6x-pvr9-888r |
| — | Microsoft.WindowsDesktop.App.Runtime.win-x86 (NuGet) | 11.0.0-preview.1 to before 11.0.0-rc.2 | 11.0.0-rc.2 | Patch available | GHSA-fq6x-pvr9-888r |
- .NET 10.0 runtime VendorMicrosoft Affected 10.0.0 to before 10.0.13 Fixed in 10.0.13 Patch available CNA
- .NET 11.0 runtime VendorMicrosoft Affected 11.0.0 to before 11.0.0-rc.2 Fixed in 11.0.0-rc.2 Patch available CNA
- .NET 8.0 runtime VendorMicrosoft Affected 8.0.0 to before 8.0.32 Fixed in 8.0.32 Patch available CNA
- .NET 9.0 runtime VendorMicrosoft Affected 9.0.0 to before 9.0.21 Fixed in 9.0.21 Patch available CNA
- Microsoft Visual Studio 2022 version 17.14 VendorMicrosoft Affected 17.14.0 to before 17.14.42 Fixed in 17.14.42 Patch available CNA
- Microsoft Visual Studio 2026 version 18.10 VendorMicrosoft Affected 18.10.0 to before 18.10.4 Fixed in 18.10.4 Patch available CNA
- Microsoft.WindowsDesktop.App.Runtime.win-arm64 (NuGet) Vendor— Affected 9.0.0 to before 9.0.21 Fixed in 9.0.21 Patch available GHSA-fq6x-pvr9-888r
- Microsoft.WindowsDesktop.App.Runtime.win-x64 (NuGet) Vendor— Affected 9.0.0 to before 9.0.21 Fixed in 9.0.21 Patch available GHSA-fq6x-pvr9-888r
- Microsoft.WindowsDesktop.App.Runtime.win-x86 (NuGet) Vendor— Affected 9.0.0 to before 9.0.21 Fixed in 9.0.21 Patch available GHSA-fq6x-pvr9-888r
- Microsoft.WindowsDesktop.App.Runtime.win-arm64 (NuGet) Vendor— Affected 10.0.0 to before 10.0.13 Fixed in 10.0.13 Patch available GHSA-fq6x-pvr9-888r
- Microsoft.WindowsDesktop.App.Runtime.win-x64 (NuGet) Vendor— Affected 10.0.0 to before 10.0.13 Fixed in 10.0.13 Patch available GHSA-fq6x-pvr9-888r
- Microsoft.WindowsDesktop.App.Runtime.win-x86 (NuGet) Vendor— Affected 10.0.0 to before 10.0.13 Fixed in 10.0.13 Patch available GHSA-fq6x-pvr9-888r
- Microsoft.WindowsDesktop.App.Runtime.win-arm64 (NuGet) Vendor— Affected 8.0.0 to before 8.0.32 Fixed in 8.0.32 Patch available GHSA-fq6x-pvr9-888r
- Microsoft.WindowsDesktop.App.Runtime.win-x64 (NuGet) Vendor— Affected 8.0.0 to before 8.0.32 Fixed in 8.0.32 Patch available GHSA-fq6x-pvr9-888r
- Microsoft.WindowsDesktop.App.Runtime.win-x86 (NuGet) Vendor— Affected 8.0.0 to before 8.0.32 Fixed in 8.0.32 Patch available GHSA-fq6x-pvr9-888r
- Microsoft.WindowsDesktop.App.Runtime.win-arm64 (NuGet) Vendor— Affected 11.0.0-preview.1 to before 11.0.0-rc.2 Fixed in 11.0.0-rc.2 Patch available GHSA-fq6x-pvr9-888r
- Microsoft.WindowsDesktop.App.Runtime.win-x64 (NuGet) Vendor— Affected 11.0.0-preview.1 to before 11.0.0-rc.2 Fixed in 11.0.0-rc.2 Patch available GHSA-fq6x-pvr9-888r
- Microsoft.WindowsDesktop.App.Runtime.win-x86 (NuGet) Vendor— Affected 11.0.0-preview.1 to before 11.0.0-rc.2 Fixed in 11.0.0-rc.2 Patch available GHSA-fq6x-pvr9-888r
Remediation
Update the .NET 8.0 runtime to 8.0.32, the .NET 9.0 runtime to 9.0.21, the .NET 10.0 runtime to 10.0.13, the .NET 11.0 runtime to 11.0.0-rc.2, Visual Studio 2022 version 17.14 to 17.14.42 and Visual Studio 2026 version 18.10 to 18.10.4. Red Hat fixes Red Hat Hardened Images in RHSA-2026:84693.
Written with Claude Haiku 5.5 from the sources below · 2026-10-28
- Fix · CNA .NET 10.0 runtime (Microsoft) Fixed in 10.0.13
- Fix · CNA .NET 11.0 runtime (Microsoft) Fixed in 11.0.0-rc.2
- Fix · CNA .NET 8.0 runtime (Microsoft) Fixed in 8.0.32
- Fix · CNA .NET 9.0 runtime (Microsoft) Fixed in 9.0.21
- Fix · CNA Microsoft Visual Studio 2022 version 17.14 (Microsoft) Fixed in 17.14.42
- Fix · CNA Microsoft Visual Studio 2026 version 18.10 (Microsoft) Fixed in 18.10.4
- Fix · GHSA-fq6x-pvr9-888r Microsoft.WindowsDesktop.App.Runtime.win-arm64 (NuGet) Fixed in 9.0.21 Advisory →
- Fix · GHSA-fq6x-pvr9-888r Microsoft.WindowsDesktop.App.Runtime.win-x64 (NuGet) Fixed in 9.0.21 Advisory →
- Fix · GHSA-fq6x-pvr9-888r Microsoft.WindowsDesktop.App.Runtime.win-x86 (NuGet) Fixed in 9.0.21 Advisory →
- Fix · GHSA-fq6x-pvr9-888r Microsoft.WindowsDesktop.App.Runtime.win-arm64 (NuGet) Fixed in 10.0.13 Advisory →
- Fix · GHSA-fq6x-pvr9-888r Microsoft.WindowsDesktop.App.Runtime.win-x64 (NuGet) Fixed in 10.0.13 Advisory →
- Fix · GHSA-fq6x-pvr9-888r Microsoft.WindowsDesktop.App.Runtime.win-x86 (NuGet) Fixed in 10.0.13 Advisory →
- Fix · GHSA-fq6x-pvr9-888r Microsoft.WindowsDesktop.App.Runtime.win-arm64 (NuGet) Fixed in 8.0.32 Advisory →
- Fix · GHSA-fq6x-pvr9-888r Microsoft.WindowsDesktop.App.Runtime.win-x64 (NuGet) Fixed in 8.0.32 Advisory →
- Fix · GHSA-fq6x-pvr9-888r Microsoft.WindowsDesktop.App.Runtime.win-x86 (NuGet) Fixed in 8.0.32 Advisory →
- Fix · GHSA-fq6x-pvr9-888r Microsoft.WindowsDesktop.App.Runtime.win-arm64 (NuGet) Fixed in 11.0.0-rc.2 Advisory →
- Fix · GHSA-fq6x-pvr9-888r Microsoft.WindowsDesktop.App.Runtime.win-x64 (NuGet) Fixed in 11.0.0-rc.2 Advisory →
- Fix · GHSA-fq6x-pvr9-888r Microsoft.WindowsDesktop.App.Runtime.win-x86 (NuGet) Fixed in 11.0.0-rc.2 Advisory →
Red Hat 1 advisory
- RHSA-2026:84693 Released 2026-10-19 · Red Hat rating ImportantRed Hat Hardened Images RPMs Security Update
- Red Hat Hardened Images aspnetcore-runtime-8.0-8.0.32-0.1.hum1@aarch64, aspnetcore-runtime-8.0-8.0.32-0.1.hum1@x86_64, aspnetcore-runtime-dbg-8.0-8.0.32-0.1.hum1@aarch64 +22
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Hardened Images | Fixed | RHSA-2026:84693 |
Not affected: 1 product
- Red Hat Hardened Images
Timeline
- 2026-10-13 Threatist record created from CVE-2026-96234
- 2026-10-13 Alias added: GHSA-fq6x-pvr9-888r
- 2026-10-13 Fix available: NuGet/[email protected], NuGet/[email protected], NuGet/[email protected] +9 · GHSA-fq6x-pvr9-888r
- 2026-10-13 CVSS score added · GHSA-fq6x-pvr9-888r
- 2026-10-13 Weakness changed · GHSA-fq6x-pvr9-888r
- 2026-10-13 4 new references · GHSA-fq6x-pvr9-888r
- 2026-10-20 2 new references · GHSA-fq6x-pvr9-888r
- 2026-10-21 Fix available: RHSA-2026:84693 · Red Hat
- 2026-10-21 Fix available: Red Hat Hardened Images · Red Hat
- 2026-10-23 Fix available: Microsoft/.NET 10.0 [email protected], Microsoft/.NET 11.0 [email protected], Microsoft/.NET 8.0 [email protected] +1 · CNA
References
More Microsoft vulnerabilities
- TI-2026-42212 Microsoft SharePoint Remote Code Execution Vulnerability KEVCVSS 3.1CRITICAL 9.8
- TI-2026-37256 Microsoft SharePoint Remote Code Execution Vulnerability KEVCVSS 3.1CRITICAL 9.8
- TI-2026-26194 Windows Internet Key Exchange (IKE) Service Extensions Remote Code Execution Vulnerability KEVCVSS 3.1CRITICAL 9.8
- TI-2026-16982 Microsoft SharePoint Remote Code Execution Vulnerability KEVCVSS 3.1CRITICAL 9.8
- TI-2025-36863 Windows Server Update Service (WSUS) Remote Code Execution Vulnerability KEVCVSS 3.1CRITICAL 9.8
- TI-2025-33671 Microsoft SharePoint Server Remote Code Execution Vulnerability KEVCVSS 3.1CRITICAL 9.8
Sources
- CVE-2026-96234 · CVE Program
- CVE-2026-96234 · NVD
- FIRST EPSS
- GHSA-fq6x-pvr9-888r · GitHub Advisory Database · CC BY 4.0
- CVE-2026-96234 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences