CVE-2026-40372

Name: CVE-2026-40372
Creator: NVD / NIST
Published: 2026-04-21T20:16:59.133+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.1/10EPSS 10.35%

Last modified Jun 17, 2026

CVE-2026-40372 is a critical-severity vulnerability rated 9.1/10 on the CVSS scale. Improper verification of cryptographic signature in ASP.NET Core allows an unauthorized attacker to elevate privileges over a network.. EPSS estimates a 10.35% chance of exploitation in the next 30 days.

Description

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

Metrics

CVSS 3.1

9.1/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

EPSS Probability

10.35%

95.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-347

Affected Software

Vendor	Product	Versions
Microsoft	Asp.Net Core	>= 10.0.0, < 10.0.7

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40372Vendor Advisory

Timeline

Published: Apr 21, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-40372?

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

How severe is CVE-2026-40372?

CVE-2026-40372 has a CVSS score of 9.1/10 (CRITICAL severity). The EPSS model estimates a 10.35% probability of exploitation in the next 30 days.

How do I fix CVE-2026-40372?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-40372?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST