CVE-2026-40372

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

CVSS 3.1

9.1CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

EPSS

11% chance of exploitation in the next 30 days; higher than 95% of CVEs (scores of 2026-10-26)

CWE

CWE-347

Published

2026-04-21

Modified

2026-10-26

Record from

the NVD, synced 2026-10-26

Affected

• microsoft:asp.net_core

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40372
• https://access.redhat.com/security/cve/CVE-2026-40372
• https://bugzilla.redhat.com/show_bug.cgi?id=2460224
• https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-40372.json

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