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Microsoft Security Response CenterCVE-2026-40372

ASP.NET Core Elevation of Privilege Vulnerability

Improper verification of cryptographic signature in ASP.NET Core allows an unauthorized attacker to elevate privileges over a network.

Read the vendor bulletin Get alerts for ASP.NET Core
9.1CVSS out of 10High severity
Scope

What the vendor says is affected

  • ASP.NET Core 10.0
  • Microsoft Visual Studio 2026 version 18.5

Versions the vendor lists as fixed

  • 10.0.7
  • 18.5.2
Next step

What the vendor recommends

Release Notes Install KB5091596.

Review the complete instructions on the vendor's site
Timeline

When this advisory changed

  1. Published by Microsoft Security Response Center

    The publication date reported by the vendor.

  2. Updated by Microsoft Security Response Center

    The vendor changed the advisory after it was first published.

  3. Added to SecurityAlert

    We collected the advisory from the official source.

Vulnerabilities

CVEs named in this advisory

CVE-2026-40372View CVSS, KEV, EPSS, and threat context
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