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CVE-2026-102870ImportantRCENetworkRevised 25 Oct

ASP.NET Core Remote Code Execution Vulnerability

MSRC advisory NVD CVE.org

Assessment

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

Severity
Important
CVSS base score
8.8CVSS: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
EPSS, next 30 days
0.9%Higher than 59.6% of scored CVEs · FIRST model run 25 Oct 2026 · about EPSS
Public exploit code
No Nuclei template lists it
Exploitability
Exploitation Less Likely
Publicly disclosed
No
Customer action
Required: apply the update
Component
ASP.NET Core
Weakness
CWE-94: Improper Control of Generation of Code ('Code Injection')
Issued by
Microsoft
Published
13 Oct 2026 · October 2026
Last revised
25 Oct 2026Updated product information in the Software Update table. This is an informational change only.
CVSS 3.1 base metricsRed raises the risk · green lowers it
Attack vector
NetworkAV:N
Attack complexity
LowAC:L
Privileges required
NonePR:N
User interaction
RequiredUI:R
Scope
UnchangedS:U
Confidentiality
HighC:H
Integrity
HighI:H
Availability
HighA:H

Updates that fix it

1 KB
KBTypeRestartApplies toOther CVEs
KB5133966 Security UpdateRequired.NET 10.0 installed on Linux, .NET 10.0 installed on Mac OS, .NET 10.0 installed on Windows and 2 moreAll CVEs in KB5133966

Affected products

Developer Tools, Other
19 affected products
  • .NET 10.0 installed on Linux
  • .NET 10.0 installed on Mac OS
  • .NET 10.0 installed on Windows
  • .NET 11.0 installed on Linux
  • .NET 11.0 installed on Mac OS
  • .NET 11.0 installed on Windows
  • Microsoft Visual Studio 2019 version 16.11
  • Microsoft Visual Studio 2022 version 17.14
  • Microsoft Visual Studio 2026 version 18.10
  • Microsoft Visual Studio 2026 version 18.11
  • Microsoft Visual Studio 2026 version 18.12
  • Microsoft.AspNetCore.Components.WebAssembly.DevServer
  • Microsoft.AspNetCore.Components.WebAssembly.Server
  • 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

What changed

First observed 14 Oct 2026
  1. 25 Oct 2026 · 19:05:13 UTC Updates that fix itKB5133966: .NET 10.0 installed on Linux, .NET 10.0 installed on Mac OS, .NET 10.0 installed on Windows, Microsoft Edge (Chromium-based), Microsoft.AspNetCore.Components.WebAssembly.Server (restart required) → KB5133966: .NET 10.0 installed on Linux, .NET 10.0 installed on Mac OS, .NET 10.0 installed on Windows, Microsoft.AspNetCore.Components.WebAssembly.DevServer, Microsoft.AspNetCore.Components.WebAssembly.Server (restart required)
  2. 25 Oct 2026 · 19:05:13 UTC Affected products.NET 10.0 installed on Linux, .NET 10.0 installed on Mac OS, .NET 10.0 installed on Windows, .NET 11.0 installed on Linux, .NET 11.0 installed on Mac OS, .NET 11.0 installed on Windows, Microsoft Edge (Chromium-based), Microsoft Visual Studio 2019 version 16.11, Microsoft Visual Studio 2022 version 17.14, Microsoft Visual Studio 2026 version 18.10, Microsoft Visual Studio 2026 version 18.11, Microsoft Visual Studio 2026 version 18.12, Microsoft.AspNetCore.Components.WebAssembly.Server, 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 → .NET 10.0 installed on Linux, .NET 10.0 installed on Mac OS, .NET 10.0 installed on Windows, .NET 11.0 installed on Linux, .NET 11.0 installed on Mac OS, .NET 11.0 installed on Windows, Microsoft Visual Studio 2019 version 16.11, Microsoft Visual Studio 2022 version 17.14, Microsoft Visual Studio 2026 version 18.10, Microsoft Visual Studio 2026 version 18.11, Microsoft Visual Studio 2026 version 18.12, Microsoft.AspNetCore.Components.WebAssembly.DevServer, Microsoft.AspNetCore.Components.WebAssembly.Server, 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
  3. 25 Oct 2026 · 17:12:51 UTC Revision noteInformation published. → Updated product information in the Software Update table. This is an informational change only.
  4. 25 Oct 2026 · 17:12:51 UTC Last revised13 Oct 2026 07:00 UTC → 25 Oct 2026 07:00 UTC
  5. 25 Oct 2026 · 17:12:51 UTC EPSS0.8%; scored 24 Oct 2026 → 0.9%; scored 25 Oct 2026
  6. 25 Oct 2026 · 17:12:51 UTC Updates that fix itNo KB listed → KB5133966: .NET 10.0 installed on Linux, .NET 10.0 installed on Mac OS, .NET 10.0 installed on Windows, Microsoft Edge (Chromium-based), Microsoft.AspNetCore.Components.WebAssembly.Server (restart required)
  7. 25 Oct 2026 · 17:12:51 UTC Affected productsMicrosoft 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 → .NET 10.0 installed on Linux, .NET 10.0 installed on Mac OS, .NET 10.0 installed on Windows, .NET 11.0 installed on Linux, .NET 11.0 installed on Mac OS, .NET 11.0 installed on Windows, Microsoft Edge (Chromium-based), Microsoft Visual Studio 2019 version 16.11, Microsoft Visual Studio 2022 version 17.14, Microsoft Visual Studio 2026 version 18.10, Microsoft Visual Studio 2026 version 18.11, Microsoft Visual Studio 2026 version 18.12, Microsoft.AspNetCore.Components.WebAssembly.Server, 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
  8. 25 Oct 2026 · 17:12:51 UTC Link: KB5133966/windows/kb/KB5133966
  9. 25 Oct 2026 · 01:34:18 UTC EPSS0.8%; scored 23 Oct 2026 → 0.8%; scored 24 Oct 2026
  10. 23 Oct 2026 · 15:51:28 UTC EPSS0.8%; scored 22 Oct 2026 → 0.8%; scored 23 Oct 2026
  11. 23 Oct 2026 · 09:33:49 UTC Public exploit codeUnknown: exploit-code evidence is incomplete or retained → No Nuclei template listed
  12. 23 Oct 2026 · 09:33:49 UTC CISA KEVUnknown: catalog evidence is incomplete or retained → Not listed in the collected catalog
Show 20 more recent changes
  1. 23 Oct 2026 · 09:33:49 UTCSource coverage: public-exploit-code Incomplete → Current
  2. 23 Oct 2026 · 09:33:49 UTCSource coverage: first-epss Incomplete → Current
  3. 23 Oct 2026 · 09:33:49 UTCSource coverage: cisa-kev Incomplete → Current
  4. 23 Oct 2026 · 09:33:49 UTCSource coverage: msrc-cvrf Incomplete → Current
  5. 23 Oct 2026 · 08:31:50 UTCPublic exploit code No Nuclei template listed → Unknown: exploit-code evidence is incomplete or retained
  6. 23 Oct 2026 · 08:31:50 UTCCISA KEV Not listed in the collected catalog → Unknown: catalog evidence is incomplete or retained
  7. 23 Oct 2026 · 08:31:50 UTCSource coverage: public-exploit-code Current → Incomplete
  8. 23 Oct 2026 · 08:31:50 UTCSource coverage: first-epss Current → Incomplete
  9. 23 Oct 2026 · 08:31:50 UTCSource coverage: cisa-kev Current → Incomplete
  10. 23 Oct 2026 · 08:31:50 UTCSource coverage: msrc-cvrf Current → Incomplete
  11. 22 Oct 2026 · 22:02:57 UTCAffected products Microsoft Visual Studio 2022 version 17.14, Microsoft Visual Studio 2026 version 18.10, Microsoft.AspNetCore.Components.WebAssembly.Server on .NET 10.0 installed on Linux, Microsoft.AspNetCore.Components.WebAssembly.Server on .NET 10.0 installed on Mac OS, Microsoft.AspNetCore.Components.WebAssembly.Server on .NET 10.0 installed on Windows, Microsoft.AspNetCore.Components.WebAssembly.Server on .NET 11.0 installed on Linux, Microsoft.AspNetCore.Components.WebAssembly.Server on .NET 11.0 installed on Mac OS, Microsoft.AspNetCore.Components.WebAssembly.Server on .NET 11.0 installed on Windows → 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
  12. 22 Oct 2026 · 17:33:15 UTCEPSS 0.8%; scored 21 Oct 2026 → 0.8%; scored 22 Oct 2026
  13. 21 Oct 2026 · 21:47:24 UTCEPSS 0.8%; scored 20 Oct 2026 → 0.8%; scored 21 Oct 2026
  14. 20 Oct 2026 · 20:53:31 UTCEPSS 0.8%; scored 19 Oct 2026 → 0.8%; scored 20 Oct 2026
  15. 19 Oct 2026 · 15:12:40 UTCEPSS 0.8%; scored 18 Oct 2026 → 0.8%; scored 19 Oct 2026
  16. 18 Oct 2026 · 14:54:30 UTCEPSS 0.8%; scored 16 Oct 2026 → 0.8%; scored 18 Oct 2026
  17. 18 Oct 2026 · 14:54:30 UTCLink: October 2026 → /security?release=2026-Oct#cves
  18. 16 Oct 2026 · 16:13:25 UTCEPSS 0.8%; scored 15 Oct 2026 → 0.8%; scored 16 Oct 2026
  19. 15 Oct 2026 · 21:30:54 UTCEPSS 0.8%; scored 14 Oct 2026 → 0.8%; scored 15 Oct 2026
  20. 15 Oct 2026 · 01:07:54 UTCEPSS Not scored → 0.8%; scored 14 Oct 2026

The most recent 100 field changes are listed. Complete recorded revisions are kept separately.

Cite this recorded revision to keep the same title, summary, facts and links when the page changes.

A day selects the latest observation by the end of that UTC day; today's selection can change until midnight. History starts when this installation records it.

Explore global source statements, affected packages and advisory history for CVE-2026-102870. The catalog has a separate collection scope from Microsoft release records.

Explicit identifiers and source references

These records connect through source-stated identifiers. Shared identifiers or dates alone do not establish shared exposure, root cause or applicability.

CVE-2026-102870 · Microsoft / collected KEV context

GHSA-g27p-qf6j-c96c

cve-program · CVE-2026-102870

nvd · CVE-2026-102870

osv · GHSA-g27p-qf6j-c96c

Related operational evidence

Explicit CVE identifiers
ChangeIntel

An IT change radar: releases, security, known issues, retirements, documentation changes, and service status from public sources. Every item links to supporting evidence; dates and statuses can change after they are read.

Sources read 26 Oct 04:30 UTC · 271 of 271 readable · 269 fully read · documentation 464/464 current

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