Vulnerability-Lookup

CVE-2026-96230 (GCVE-0-2026-96230)

Vulnerability from cvelistv5 – Published: 2026-10-13 19:01 – Updated: 2026-10-13 22:23

Title

ASP.NET Core Remote Code Execution Vulnerability

Summary

Improper neutralization of input during web page generation ('cross-site scripting') in ASP.NET Core allows an unauthorized attacker to execute code over a network.

Severity

8.8 (High)


                        
                          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

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-10-13 19:46 UTC

CWE

CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Assigner

microsoft CNA under the mitre root

CNA scorecard B 82/100 over 3923 records in the last 180 days details

References

1 reference

URL	Tags
https://msrc.microsoft.com/update-guide/vulnerabi…	vendor-advisorypatch

Impacted products

3 products

Vendor	Product	Version	CPE status
Microsoft	Microsoft Visual Studio 2022 version 17.14	Affected: 17.14.0 , < 17.14.42 (custom)	guessed
Microsoft	Microsoft Visual Studio 2026 version 18.10	Affected: 18.10.0 , < 18.10.4 (custom)	guessed
Microsoft	Microsoft.AspNetCore.Components.WebAssembly.Server	Affected: 10.0.0 , < 10.0.13 (custom)	guessed

Date Public

2026-10-13 14:00

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-96230

Vulnerability from fkie_nvd - Published: 2026-10-13 19:21 - Updated: 2026-10-13 20:19

Severity

8.8 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Summary

Improper neutralization of input during web page generation ('cross-site scripting') in ASP.NET Core allows an unauthorized attacker to execute code over a network.

References

	URL	Tags
	secure@microsoft.com	https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-96230

Impacted products

	Vendor	Product	Version

JSON

To clipboard

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GHSA-QJPX-JQM5-H2C4

Vulnerability from github – Published: 2026-10-13 20:51 – Updated: 2026-10-13 20:51

Summary

Microsoft Security Advisory CVE-2026-96230 - ASP.NET Core Remote Code Execution Vulnerability

Details

Executive summary

Microsoft is releasing this security advisory to provide information about a vulnerability 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 development-server debug page can reflect unencoded exception text, allowing cross-origin script injection through the unauthenticated /_framework/debug endpoint used by dotnet watch.

Announcement

Announcement for this issue can be found at https://github.com/dotnet/announcements/issues/478

CVSS Details

Version: 3.1
Severity: High
Score: 8.8
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Weakness: CWE-79 (Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting'))

Affected Platforms

Platforms: Windows, Linux, macOS
Architectures: All

Affected Packages

The vulnerability affects Microsoft .NET projects that use an affected package version listed below.

Package name	Affected version	Patched version
Microsoft.AspNetCore.Components.WebAssembly.Server	>= 10.0.0, <= 10.0.12	10.0.13
Microsoft.AspNetCore.Components.WebAssembly.Server	>= 11.0.0-preview.1, <= 11.0.0-rc.1	11.0.0-rc.2
Microsoft.AspNetCore.Components.WebAssembly.Server	>= 8.0.0, <= 8.0.31	8.0.32
Microsoft.AspNetCore.Components.WebAssembly.Server	>= 9.0.0, <= 9.0.20	9.0.21

Advisory FAQ

How do I know if I am affected?

If using a package listed in affected packages, you're exposed to the vulnerability.

How do I fix the issue?

To fix the issue please install the latest version of .NET. If you have installed one or more .NET SDKs through Visual Studio, Visual Studio will prompt you to update Visual Studio, which will also update your .NET SDKs.
If your application references the vulnerable package, update the package reference to the patched version. You can list the versions you have installed by running the dotnet --info command.

Once you have installed the updated runtime or SDK, restart your apps for the update to take effect.

Additionally, if you've deployed self-contained applications targeting any of the impacted versions, these applications are also vulnerable and must be recompiled and redeployed.

Other Information

Reporting Security Issues

If you have found a potential security issue in a supported version of .NET, please report it to the Microsoft Security Response Center (MSRC) via the MSRC Researcher Portal. Further information can be found in the MSRC Report an Issue FAQ.

Security reports made through MSRC may qualify for the Microsoft .NET Bounty. Details of the Microsoft .NET Bounty Program including terms and conditions are at https://aka.ms/corebounty.

Support

You can ask questions about this issue on GitHub in the .NET GitHub organization. The main repos are located at https://github.com/dotnet/runtime. The Announcements repo (https://github.com/dotnet/Announcements) will contain this bulletin as an issue and will include a link to a discussion issue. You can ask questions in the linked discussion issue.

Disclaimer

The information provided in this advisory is provided "as is" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.

External Links

CVE-2026-96230

Acknowledgements

Kevin Gosse

Revisions

V1.0 (10/13/2026): Advisory published.

Severity

8.8 (High)


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

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{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 10.0.12"
      },
      "package": {
        "ecosystem": "NuGet",
        "name": "Microsoft.AspNetCore.Components.WebAssembly.Server"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "10.0.0"
            },
            {
              "fixed": "10.0.13"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 11.0.0-rc.1"
      },
      "package": {
        "ecosystem": "NuGet",
        "name": "Microsoft.AspNetCore.Components.WebAssembly.Server"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "11.0.0-preview.1"
            },
            {
              "fixed": "11.0.0-rc.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 8.0.31"
      },
      "package": {
        "ecosystem": "NuGet",
        "name": "Microsoft.AspNetCore.Components.WebAssembly.Server"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "8.0.0"
            },
            {
              "fixed": "8.0.32"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 9.0.20"
      },
      "package": {
        "ecosystem": "NuGet",
        "name": "Microsoft.AspNetCore.Components.WebAssembly.Server"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "9.0.0"
            },
            {
              "fixed": "9.0.21"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-96230"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-79"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-10-13T20:51:12Z",
    "nvd_published_at": null,
    "severity": "HIGH"
  },
  "details": "## Executive summary\n\nMicrosoft is releasing this security advisory to provide information about a vulnerability in Microsoft.AspNetCore.Components.WebAssembly.Server. This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability.\n\nThe Blazor WebAssembly development-server debug page can reflect unencoded exception text, allowing cross-origin script injection through the unauthenticated `/_framework/debug` endpoint used by `dotnet watch`.\n\n## Announcement\n\nAnnouncement for this issue can be found at https://github.com/dotnet/announcements/issues/478\n\n## CVSS Details\n\n- **Version:** 3.1\n- **Severity:** High\n- **Score:** 8.8\n- **Vector:** `CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H`\n- **Weakness:** CWE-79 (Improper Neutralization of Input During Web Page Generation (\u0027Cross-site Scripting\u0027))\n\n## Affected Platforms\n\n- **Platforms:** Windows, Linux, macOS\n- **Architectures:** All\n\n## \u003ca name=\"affected-packages\"\u003e\u003c/a\u003eAffected Packages\n\nThe vulnerability affects Microsoft .NET projects that use an affected package version listed below.\n\nPackage name | Affected version | Patched version\n------------ | ---------------- | ---------------\n[Microsoft.AspNetCore.Components.WebAssembly.Server](https://www.nuget.org/packages/Microsoft.AspNetCore.Components.WebAssembly.Server) | \u003e= 10.0.0, \u003c= 10.0.12 | 10.0.13\n[Microsoft.AspNetCore.Components.WebAssembly.Server](https://www.nuget.org/packages/Microsoft.AspNetCore.Components.WebAssembly.Server) | \u003e= 11.0.0-preview.1, \u003c= 11.0.0-rc.1 | 11.0.0-rc.2\n[Microsoft.AspNetCore.Components.WebAssembly.Server](https://www.nuget.org/packages/Microsoft.AspNetCore.Components.WebAssembly.Server) | \u003e= 8.0.0, \u003c= 8.0.31 | 8.0.32\n[Microsoft.AspNetCore.Components.WebAssembly.Server](https://www.nuget.org/packages/Microsoft.AspNetCore.Components.WebAssembly.Server) | \u003e= 9.0.0, \u003c= 9.0.20 | 9.0.21\n\n## Advisory FAQ\n\n### \u003ca name=\"how-affected\"\u003e\u003c/a\u003eHow do I know if I am affected?\n\nIf using a package listed in [affected packages](#affected-packages), you\u0027re exposed to the vulnerability.\n\n### \u003ca name=\"how-fix\"\u003e\u003c/a\u003eHow do I fix the issue?\n\n1. To fix the issue please install the latest version of .NET. If you have installed one or more .NET SDKs through Visual Studio, Visual Studio will prompt you to update Visual Studio, which will also update your .NET SDKs.\n2. If your application references the vulnerable package, update the package reference to the patched version. You can list the versions you have installed by running the `dotnet --info` command.\n\nOnce you have installed the updated runtime or SDK, restart your apps for the update to take effect.\n\nAdditionally, if you\u0027ve deployed [self-contained applications](https://docs.microsoft.com/dotnet/core/deploying/#self-contained-deployments-scd) targeting any of the impacted versions, these applications are also vulnerable and must be recompiled and redeployed.\n\n## Other Information\n\n### Reporting Security Issues\n\nIf you have found a potential security issue in a supported version of .NET, please report it to the Microsoft Security Response Center (MSRC) via the [MSRC Researcher Portal](https://msrc.microsoft.com/report/vulnerability/new). Further information can be found in the MSRC [Report an Issue FAQ](https://www.microsoft.com/msrc/faqs-report-an-issue).\n\nSecurity reports made through MSRC may qualify for the Microsoft .NET Bounty. Details of the Microsoft .NET Bounty Program including terms and conditions are at https://aka.ms/corebounty.\n\n### Support\n\nYou can ask questions about this issue on GitHub in the .NET GitHub organization. The main repos are located at https://github.com/dotnet/runtime. The Announcements repo (https://github.com/dotnet/Announcements) will contain this bulletin as an issue and will include a link to a discussion issue. You can ask questions in the linked discussion issue.\n\n### Disclaimer\n\nThe information provided in this advisory is provided \"as is\" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.\n\n### External Links\n\n[CVE-2026-96230](https://www.cve.org/CVERecord?id=CVE-2026-96230)\n\n### Acknowledgements\n\n- Kevin Gosse\n\n### Revisions\n\nV1.0 (10/13/2026): Advisory published.",
  "id": "GHSA-qjpx-jqm5-h2c4",
  "modified": "2026-10-13T20:51:12Z",
  "published": "2026-10-13T20:51:12Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/dotnet/aspnetcore/security/advisories/GHSA-qjpx-jqm5-h2c4"
    },
    {
      "type": "WEB",
      "url": "https://github.com/dotnet/announcements/issues/478"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/dotnet/aspnetcore"
    },
    {
      "type": "WEB",
      "url": "https://github.com/dotnet/aspnetcore/discussions/69802"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Microsoft Security Advisory CVE-2026-96230 - ASP.NET Core Remote Code Execution Vulnerability"
}

NCSC-2026-0426

Vulnerability from csaf_ncscnl - Published: 2026-10-13 18:56 - Updated: 2026-10-13 18:56

Summary

Kwetsbaarheden verholpen in Microsoft Developer Tools

Scope

62 vulnerabilities in this advisory, including CVE-2026-96230.

CVE-2026-96230

Known affected: 36 products

Open the full advisory

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2026-96230 (GCVE-0-2026-96230)

FKIE_CVE-2026-96230

GHSA-QJPX-JQM5-H2C4

Executive summary

Announcement

CVSS Details

Affected Platforms

Affected Packages

Advisory FAQ

How do I know if I am affected?

How do I fix the issue?

Other Information

Reporting Security Issues

Support

Disclaimer

External Links

Acknowledgements

Revisions

NCSC-2026-0426

Tags

Sightings

Nomenclature

Related by attack behaviour