.NET Remote Code Execution vulnerability

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

7.8 · CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS

• CVE-2023-28260: 1.54% estimated exploitation activity in the next 30 days; percentile 75.00 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Microsoft Security Advisory CVE-2023-28260: .NET Remote Code Execution Vulnerability <a name="executive-summary"</aExecutive summary Microsoft is releasing this security advisory to provide information about a vulnerability in .NET 7.0 and .NET 6.0. This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability. A vulnerability exists in .NET running on Windows where a runtime DLL can be loaded from an unexpected location, resulting in remote code execution. Announcement Announcement for this issue can be found at https://github.com/dotnet/announcements/issues/250 <a name="mitigation-factors"</aMitigation factors Microsoft has not identified any mitigating factors for this vulnerability. <a name="affected-software"</aAffected software Any .NET 7.0 application running on .NET 7.0.4 or earlier. Any .NET 6.0 application running on .NET 6.0.15 or earlier. Advisory FAQ <a name="how-affected"</aHow do I know if I am affected? If you…

Published by the source

11 Apr 2023, 22:02 UTC

Last modified by the source

19 Apr 2023, 17:08 UTC

Source last checked

26 Oct 2026, 16:59 UTC

1. Revision 1 · created · 26 Oct 2026

   Published from ghsa record GHSA-w4m3-43gp-x8hx

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# Patch Next advisory brief: CVE-2023-28260

Advisory: .NET Remote Code Execution vulnerability
IDs: CVE-2023-28260, GHSA-w4m3-43gp-x8hx
Record: https://patchnext.com/advisories/cve-2023-28260 (revision 1, source checked 26 Oct 2026, 16:59 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 7.8)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: microsoft.netcore.app.runtime.win-x86 7.0.5, 6.0.16; microsoft.netcore.app.runtime.win-arm64 7.0.5, 6.0.16; microsoft.netcore.app.runtime.win-arm 7.0.5, 6.0.16; microsoft.netcore.app.runtime.win-x64 7.0.5, 6.0.16. A vendor fix does not mean a deployment is fixed.

## Affected components
- NuGet microsoft.netcore.app.runtime.win-x86: affected >= 7.0.0, <= 7.0.4; >= 6.0.0, <= 6.0.15; fixed in 6.0.16, 7.0.5
- NuGet microsoft.netcore.app.runtime.win-arm64: affected >= 7.0.0, <= 7.0.4; >= 6.0.0, <= 6.0.15; fixed in 6.0.16, 7.0.5
- NuGet microsoft.netcore.app.runtime.win-arm: affected >= 7.0.0, <= 7.0.4; >= 6.0.0, <= 6.0.15; fixed in 6.0.16, 7.0.5
- NuGet microsoft.netcore.app.runtime.win-x64: affected >= 6.0.0, <= 6.0.15; >= 7.0.0, <= 7.0.4; fixed in 6.0.16, 7.0.5

## Suggested inspection (read-only)
- NuGet microsoft.netcore.app.runtime.win-x86: check the installed version with your package manager.
- NuGet microsoft.netcore.app.runtime.win-arm64: check the installed version with your package manager.
- NuGet microsoft.netcore.app.runtime.win-arm: check the installed version with your package manager.
- NuGet microsoft.netcore.app.runtime.win-x64: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on microsoft.netcore.app.runtime.win-x86, microsoft.netcore.app.runtime.win-arm64, microsoft.netcore.app.runtime.win-arm, microsoft.netcore.app.runtime.win-x64.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-w4m3-43gp-x8hx (GitHub-reviewed advisory GHSA-w4m3-43gp-x8hx lists affected ranges: NuGet microsoft.netcore.app.runtime.win-arm >=7.0.0 =6.0.0 =7.0.0 =6.0.0 =7.0.0 =6.0.0 =6.0.0 =7.0.0 <=7.0.4)

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