Critical Microsoft ASP.NET Core Vulnerability Enables System Privilege Escalation
Microsoft has released urgent security updates for ASP.NET Core to address CVE-2026-40372, a critical elevation of privilege vulnerability. Flaws in cryptographic signature validation allow unauthenticated attackers to forge authentication cookies and gain SYSTEM-level access. The vulnerability primarily impacts non-Windows environments using the Data Protection package, requiring immediate patching of affected container and server deployments. Read more