# CVE-2026-118741: ASP.NET Core Elevation of Privilege Vulnerability

Status: published. Published: 2026-11-10. Updated: 2026-11-12.

Improper authentication in ASP.NET Core allows an unauthorized attacker to elevate privileges over a network.

## Remediation

- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: CNA: microsoft) — https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-118741

## Affected products and versions

- Microsoft / Microsoft.dotnet-scaffold: ≥ 10.0.0; < 20.3.0 (affected, custom). Source: CNA: microsoft
- Microsoft / Microsoft.dotnet-scaffold-aspnet: ≥ 9.0.0; < 20.3.0 (affected, custom). Source: CNA: microsoft
- Microsoft / Microsoft.DotNet.Web.ProjectTemplates.10.0: ≥ 10.0.13; < 10.0.15 (affected, custom). Source: CNA: microsoft; platforms: .NET 10.0
- Microsoft / Microsoft.DotNet.Web.ProjectTemplates.8.0: ≥ 8.0.32; < 8.0.34 (affected, custom). Source: CNA: microsoft; platforms: .NET 8.0
- Microsoft / Microsoft.DotNet.Web.ProjectTemplates.9.0: ≥ 9.0.21; < 9.0.23 (affected, custom). Source: CNA: microsoft; platforms: .NET 9.0
- Microsoft / Microsoft.VisualStudio.Web.CodeGeneration.Design: ≥ NOT_YET_AVAILABLE; < 9.0.13 (affected, custom). Source: CNA: microsoft; platforms: .NET 10.0, .NET 8.0, .NET 9.0
- Microsoft / Microsoft.VisualStudio.Web.CodeGenerators.Mvc: ≥ NOT_YET_AVAILABLE; < 9.0.13 (affected, custom). Source: CNA: microsoft; platforms: .NET 10.0, .NET 8.0, .NET 9.0

## Severity and prioritization

- CVSS 3.1: 8.1 (high); CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C; source: CNA: microsoft

- CVSS 3.1: 8.1 (high); CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H; source: NVD: secure@microsoft.com

- CISA KEV: No listing in collected sources

- EPSS: 0.76% as of 2026-11-12; percentile 55.68%

- SSVC: exploitation none; automatable no; technical impact total; source ADP: CISA-ADP

- Weaknesses: CWE-640

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-118741 (CNA: microsoft; vendor-advisory, patch)

- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-118741 (secure@microsoft.com)

## Provenance

- CNA: microsoft: https://www.cve.org/CVERecord?id=CVE-2026-118741; retrieved 2026-11-12; source updated 2026-11-12

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-118741; retrieved 2026-11-11; source updated 2026-11-11

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-118741; retrieved 2026-11-12; source updated Not reported

Revision: d2ae804158dbfbd71ab4fab0fc9198b3c0e8700c35994c15cdc7f446e0d1d75f

Canonical: https://y2.dev/cve/CVE-2026-118741

## Agent and API access

Public CVE pages, Markdown, and JSON are free to read without an account or API key.

- Public catalog: https://y2.dev/cve/index.json. Follow nextCursor with the same search, filters, sort, and limit (1–100). A null cursor marks the end.

- WebMCP: search_cve_disclosures, get_cve_disclosure, get_cve_page_markdown, get_y2_cve_access. Available in compatible browsers.

- Cyber API: https://api.y2.dev/api/v2/cyber/cves and https://api.y2.dev/api/v2/cyber/cves/{cveId}.

- Y2 Pro or Elite: create a workspace API key with the intel:cyber scope and send Authorization: Bearer <Y2_API_KEY>. Setup: https://y2.dev/docs/api/create-key.

- x402: Pay per request without an account or API key. Omit Authorization, read the HTTP 402 PAYMENT-REQUIRED challenge, validate its current requirements, and retry with PAYMENT-SIGNATURE through an authorized payment client. These browser tools never make payments. Guide: https://y2.dev/docs/api/x402.

- OpenAPI: https://y2.dev/api/openapi.yaml. Agent access metadata: https://y2.dev/cve/agent.json.

Collected public records only. Check source status for coverage and freshness.