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CVE-2026-102870

8.8 high SSVC exploitation: none Published
NVD · CVE.org

Improper control of generation of code ('code injection') in ASP.NET Core allows an unauthorized attacker to execute code over a network.

Fix

Microsoft's update · Important

  • Release Notes — Microsoft Visual Studio 2026 version 18.10 · build 18.10.4 · restart required
  • Release Notes — Microsoft Visual Studio 2022 version 17.14 · build 17.14.43 · restart required
  • Release Notes — Microsoft.AspNetCore.Components.WebAssembly.Server on .NET 10.0 runtime installed on Windows, Microsoft.AspNetCore.Components.WebAssembly.Server on .NET 10.0 runtime installed on Linux, Microsoft.AspNetCore.Components.WebAssembly.Server on .NET 10.0 runtime installed on Mac OS · build 10.0.13
  • Release Notes — Microsoft.AspNetCore.Components.WebAssembly.Server on .NET 11.0 runtime installed on Windows, Microsoft.AspNetCore.Components.WebAssembly.Server on .NET 11.0 runtime installed on Linux, Microsoft.AspNetCore.Components.WebAssembly.Server on .NET 11.0 runtime installed on Mac OS · build 11.0.0-rc.2.26478.115
  • KB5133966 — Microsoft.AspNetCore.Components.WebAssembly.Server, Microsoft.AspNetCore.Components.WebAssembly.DevServer · build 10.0.14 · restart required
  • KB5133966 — .NET 10.0 installed on Windows, .NET 10.0 installed on Linux, .NET 10.0 installed on Mac OS · build 10.0.403 · restart required
  • Release Notes — .NET 11.0 installed on Windows, .NET 11.0 installed on Linux, .NET 11.0 installed on Mac OS · build 11.0.100-rc.3 · restart required
  • Release Notes — Microsoft Visual Studio 2019 version 16.11 · build 16.11.61 · restart required
  • Release Notes — Microsoft Visual Studio 2026 version 18.11 · build 18.11.2 · restart required
  • Release Notes — Microsoft Visual Studio 2026 version 18.12 · build 18.12 Insiders 3 · restart required

From the 2026-Oct release note of Microsoft's Security Update Guide, revised 2026-10-28 · Exploitation Less Likely.

Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.

Change history 6

  1. StatusUndergoing Analysis → PublishedNVD modified 2026-10-25 18:48
  2. StatusPublished → Undergoing AnalysisNVD modified 2026-10-25 18:16
  3. StatusUndergoing Analysis → PublishedNVD modified 2026-10-22 21:56
  4. StatusPublished → Undergoing AnalysisNVD modified 2026-10-22 22:17
  5. StatusAwaiting Analysis → PublishedNVD modified 2026-10-19 19:41
  6. First seenCVSS 8.8NVD modified 2026-10-14 04:18

Affected (CPE criteria) 0

NVD has not attached CPE configurations yet.

References 1