Is CVE-2026-40372 actively exploited?

CVE-2026-40372 has no public evidence of in-the-wild exploitation as of 2026-04-27.

What is the CVSS score for CVE-2026-40372?

CVE-2026-40372 has a CVSS score of 9.1 (CRITICAL severity). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N.

Patch guidance is available from microsoft security advisories. CVEDatabase generates AI-assisted remediation guidance on demand for CVE-2026-40372.

1 product: microsoft asp.net core.

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

Primary Vendor: MICROSOFT
Published: 4/21/2026
Last Modified: 4/27/2026
Source: NIST NVD
Note: Verify all details with official vendor sources before applying patches.