Microsoft Patches Critical ASP.NET Core CVE-2026-40372 Privilege Escalation Bug

Wed, 22 Apr 2026 11:29:00 +0200

Microsoft has released out-of-band updates to address a security vulnerability in ASP.NET Core that could allow an attacker to escalate privileges. The vulnerability, tracked as CVE-2026-40372, carries a CVSS score of 9.1 out of 10.0. It's rated Important in severity. An anonymous researcher has been credited with discovering and reporting the flaw. "Improper verification of cryptographic