CVE-2026-40372

ASP.NET Core: ASP.NET: ASP.NET Core: Privilege escalation via improper cryptographic signature verification

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Severity

Critical

Red Hat Product Security

9.1

CVSS 3.1

Review impact separately from score.

Published · April 22, 2026

Updated · November 5, 2026

Description

A flaw was found in ASP.NET Core due to improper verification of cryptographic signatures. An unauthorized attacker can exploit this vulnerability remotely over a network, leading to privilege escalation.

Statement

No Red Hat products are affected as this vulnerability is specific to Microsoft.AspNetCore.DataProtection 10.0.6 from NuGet.

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

No mitigation is specified in collected source.

CVSS / CWE

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

CWE-347 · Improper Verification of Cryptographic Signature