ASP.NET Core Remote Code Execution Vulnerability

CVE

CVE-2026-102870

Severity

Important

CVSS base score

8.8

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C

Impact

Remote Code Execution

Exploitation detected

Not reported by MSRC

Publicly disclosed

No

Exploitability

Exploitation Less Likely

Component

ASP.NET Core

Weakness

CWE-94: Improper Control of Generation of Code ('Code Injection')

Issued by

Microsoft

Customer action

Required: apply the update

Affected products

Microsoft Visual Studio 2022 version 17.14, Microsoft Visual Studio 2026 version 18.10, 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, Microsoft.AspNetCore.Components.WebAssembly.Server on .NET 10.0 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, Microsoft.AspNetCore.Components.WebAssembly.Server on .NET 11.0 runtime installed on Windows

Updates that fix it

No KB listed

CISA KEV

Not listed in the collected catalog

EPSS

0.8%; scored 23 Oct 2026

Public exploit code

No Nuclei template listed

Published

13 Oct 2026 07:00 UTC

Last revised

13 Oct 2026 07:00 UTC

Revision note

Information published.

• MSRC advisory
• NVD
• CVE.org
• October 2026

Microsoft security releases

Complete at observationRead 23 Oct 2026 at 15:50 UTC

CISA KEV

Complete at observationRead 23 Oct 2026 at 15:50 UTC

FIRST EPSS

Complete at observationRead 23 Oct 2026 at 15:50 UTC

Public exploit code

Complete at observationRead 23 Oct 2026 at 15:50 UTC

Coverage describes the sources at this observation. A complete read then does not establish their current position.

1. 23 Oct 2026 · 15:51:28 UTC EPSS0.8%; scored 22 Oct 2026 → 0.8%; scored 23 Oct 2026
2. 23 Oct 2026 · 09:33:49 UTC Public exploit codeUnknown: exploit-code evidence is incomplete or retained → No Nuclei template listed
3. 23 Oct 2026 · 09:33:49 UTC CISA KEVUnknown: catalog evidence is incomplete or retained → Not listed in the collected catalog
4. 23 Oct 2026 · 09:33:49 UTC Source coverage: public-exploit-codeIncomplete → Current
5. 23 Oct 2026 · 09:33:49 UTC Source coverage: first-epssIncomplete → Current
6. 23 Oct 2026 · 09:33:49 UTC Source coverage: cisa-kevIncomplete → Current
7. 23 Oct 2026 · 09:33:49 UTC Source coverage: msrc-cvrfIncomplete → Current
8. 23 Oct 2026 · 08:31:50 UTC Public exploit codeNo Nuclei template listed → Unknown: exploit-code evidence is incomplete or retained
9. 23 Oct 2026 · 08:31:50 UTC CISA KEVNot listed in the collected catalog → Unknown: catalog evidence is incomplete or retained
10. 23 Oct 2026 · 08:31:50 UTC Source coverage: public-exploit-codeCurrent → Incomplete
11. 23 Oct 2026 · 08:31:50 UTC Source coverage: first-epssCurrent → Incomplete
12. 23 Oct 2026 · 08:31:50 UTC Source coverage: cisa-kevCurrent → Incomplete

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