CVE-2026-102870 — ASP.NET Core Remote Code Execution Vulnerability

Executive Summary

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

Overview

8.8

CVSS HIGH

Important

MS Severity

Not Exploited

MS Exploit Status

Less Likely

MS Exploit Likelihood

Category Remote Code Execution

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

Released Oct 13 2026

Last Updated Oct 13 2026

Publicly Disclosed No

CISA KEV Not Listed

Known Exploits None Known

CVSS Vector

ATTACK VECTOR

Network

ATTACK COMPLEXITY

Low

PRIVILEGES REQUIRED

None

USER INTERACTION

Required

SCOPE

Unchanged

CONFIDENTIALITY

High

INTEGRITY

High

AVAILABILITY

High

EXPLOIT CODE MATURITY

Unproven

REMEDIATION LEVEL

Official Fix

REPORT CONFIDENCE

Confirmed

Temporal Score: 7.7

EPSS Score

No EPSS score available for this CVE.

View on FIRST.org

Affected Products

8 affected products

Product	KB Article	Severity	Impact	Restart Required
Microsoft Visual Studio 2022 version 17.14	`Release Notes (Security Update)`	Important	Remote Code Execution	Yes
Microsoft Visual Studio 2026 version 18.10	`Release Notes (Security Update)`	Important	Remote Code Execution	Yes
Microsoft.AspNetCore.Components.WebAssembly.Server on .NET 10.0 installed on Linux	`Release Notes (Security Update)`	Important	Remote Code Execution	Unknown
Microsoft.AspNetCore.Components.WebAssembly.Server on .NET 10.0 installed on Mac OS	`Release Notes (Security Update)`	Important	Remote Code Execution	Unknown
Microsoft.AspNetCore.Components.WebAssembly.Server on .NET 10.0 installed on Windows	`Release Notes (Security Update)`	Important	Remote Code Execution	Unknown
Microsoft.AspNetCore.Components.WebAssembly.Server on .NET 11.0 installed on Linux	`Release Notes (Security Update)`	Important	Remote Code Execution	Unknown
Microsoft.AspNetCore.Components.WebAssembly.Server on .NET 11.0 installed on Mac OS	`Release Notes (Security Update)`	Important	Remote Code Execution	Unknown
Microsoft.AspNetCore.Components.WebAssembly.Server on .NET 11.0 installed on Windows	`Release Notes (Security Update)`	Important	Remote Code Execution	Unknown

Patches

1 patch

Article	Type	Restart
`Release Notes`	Security Update	Yes

Exploits & PoC

No public exploit or PoC has been linked for this CVE yet. When available, references are sourced from public repositories and may be unverified or non-functional — review carefully before use.

Detection Rules

No public Sigma or Nuclei detection rule has been mapped to this CVE yet. Coverage is concentrated on exploited / high-profile vulnerabilities; check SigmaHQ for updates.

Acknowledgments

alittleston3

References

MSRC Advisory MITRE NVD