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Vulnerabilities

Vulnerability · CVE-2026-102870

Microsoft Security Advisory CVE-2026-102870 - ASP.NET Core Remote Code Execution Vulnerability

Published Oct 13, 2026 · Microsoft Security Advisory -

Check if you run it

No confirmed exploitation is on record for CVE-2026-102870. EPSS is 0.78%. Act only if a listed version of Microsoft Security Advisory - is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (Microsoft Security Advisory -).
  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Unknown—
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.78%
Remediation
Not established
Affected products
nuget microsoft.aspnetcore.components.webassembly.server

Microsoft is releasing this security advisory to provide information about a vulnerability in the Blazor WebAssembly debugger included in Microsoft.AspNetCore.Components.WebAssembly.Server. This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability. The Blazor WebAssembly debug proxy evaluates debugger expressions by generating and compiling C# source. Certain values originating in the application being debugged, including ToString() results, descriptions, and class names, are embedded in …

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • nuget microsoft.aspnetcore.components.webassembly.serverversion unspecified

How to fix CVE-2026-102870

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-102870. EPSS is 0.78%. Act only if a listed version of Microsoft Security Advisory - is installed.

Which versions are affected?

Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.78%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Oct 13, 2026 · GitLab Advisory Database

    Detected

    Microsoft is releasing this security advisory to provide information about a vulnerability in the Blazor WebAssembly debugger included in Microsoft.AspNetCore.Components.WebAssembly.Server. This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability. The Blazor WebAssembly debug proxy evaluates debugger expressions by generating and comp

Sources

  • CVE.orgVulnerability recordCVE-2026-102870

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-102870

    30-day exploitation probability 0.8%

    first.org
  • GitLab Advisory DatabasePackage advisoryCVE-2026-102870

    Microsoft is releasing this security advisory to provide information about a vulnerability in the Blazor WebAssembly debugger included in Microsoft.AspNetCore.Components.WebAssembly.Server. This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability. The Blazor WebAssembly debug proxy evaluates debugger expressions by generating and comp

    advisories.gitlab.com

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.