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Description

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

PUBLISHED Reserved 2026-04-11 | Published 2026-04-21 | Updated 2026-04-28 | Assigner microsoft




CRITICAL: 9.1CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C

Problem types

CWE-347: Improper Verification of Cryptographic Signature

Product status

10.0 (custom) before 10.0.7
affected

18.5.0 (custom) before 18.5.2
affected

References

msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40372 (ASP.NET Core Elevation of Privilege Vulnerability) vendor-advisory patch

cve.org (CVE-2026-40372)

nvd.nist.gov (CVE-2026-40372)

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