Priority reviewCritical

CVE-2026-40372

Microsoft ASP.NET Core 10.0, Microsoft Visual Studio 2026 version 18.5, Red Hat Enterprise Linux 10

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

PRIORITY ASSESSMENT

FIRST EPSS indicates an elevated probability of exploitation.

Known exploitationNot established by KEV

Exploit probability11.2%

Technical severityCVSS 9.1

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

Product: Microsoft ASP.NET Core 10.0, Microsoft Visual Studio 2026 version 18.5, Red Hat Enterprise Linux 10
Affected versions: >= 10.0 < 10.0.7, >= 18.5.0 < 18.5.2, >= 10.0.0 < 10.0.7
Fixed versions: 10.0.7

Confirm exposure before applying a vendor-supported change.

1
Identify
Confirm that Microsoft ASP.NET Core 10.0, Microsoft Visual Studio 2026 version 18.5, Red Hat Enterprise Linux 10 and an affected version are present.
2
Prioritize
Combine exploitation signals with asset exposure and business criticality.
3
Remediate
Follow the vendor advisory or supported update path and preserve rollback options.
4
Verify
Recheck the version, service health, access paths, and relevant logs.