CVE-2026-40372: Microsoft ASP.NET Core

Critical severity, CVSS 9.1. EPSS: 0.8% chance of exploitation in the next 30 days.

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

Affected products

• Microsoft ASP.NET Core: from 10.0.0, before 10.0.7 (fixed in 10.0.7)

Published 2026-04-21. Last modified 2026-07-15.