What’s Vulnerable › Vulnerabilities

CVE-2026-40372: ASP.NET Core Elevation of Privilege Vulnerability

• Severity: critical (CVSS 9.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 11.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-04-21 · updated 2026-10-26
• Weakness: CWE-347

Description

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

Affected products

• Microsoft .NET Core: from 10.0.0 before 10.0.7 — fixed in 10.0.7
• Microsoft ASP.NET Core 10.0: from 10.0 before 10.0.7 — fixed in 10.0.7
• Microsoft Visual Studio 2026 version 18.5: from 18.5.0 before 18.5.2 — fixed in 18.5.2

How to fix

Upgrade to a fixed version: Microsoft .NET Core 10.0.7; Microsoft ASP.NET Core 10.0 10.0.7; Microsoft Visual Studio 2026 version 18.5 18.5.2. Check the vendor advisory for mitigations.

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40372
• https://access.redhat.com/security/cve/CVE-2026-40372
• https://bugzilla.redhat.com/show_bug.cgi?id=2460224
• https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-40372.json

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