ASP.NET Core Elevation of Privilege Vulnerability

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Summary

CVECVE-2026-40372
StatePUBLISHED
Assignermicrosoft
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-21 20:16:59 UTC
Updated2026-06-27 05:16:44 UTC
DescriptionImproper verification of cryptographic signature in ASP.NET Core allows an unauthorized attacker to elevate privileges over a network.

Risk And Classification

Primary CVSS: v3.1 9.1 CRITICAL from ADP

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

EPSS: 0.000230000 probability, percentile 0.062830000 (date 2026-04-27)

Problem Types: CWE-347 | CWE-347 CWE-347: Improper Verification of Cryptographic Signature | CWE-347 Improper Verification of Cryptographic Signature

VersionSourceTypeScoreSeverityVector
3.1ADPCVSS9.1CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
3.1[email protected]Secondary9.1CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
3.10b0ca135-0b70-47e7-9f44-1890c2a1c46cSecondary9.1CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
3.1CNACVSS9.1CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None

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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Microsoft Asp.net Core All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Microsoft ASP.NET Core 10.0 affected 10.0 10.0.7 custom Not specified
CNA Microsoft Microsoft Visual Studio 2026 Version 18.5 affected 18.5.0 18.5.2 custom Not specified
ADP Red Hat Red Hat Enterprise Linux 10 Not specified Not specified
ADP Red Hat Red Hat Enterprise Linux 8 Not specified Not specified
ADP Red Hat Red Hat Enterprise Linux 9 Not specified Not specified

References

ReferenceSourceLinkTags
bugzilla.redhat.com/show_bug.cgi 0b0ca135-0b70-47e7-9f44-1890c2a1c46c bugzilla.redhat.com
security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-40372.json 0b0ca135-0b70-47e7-9f44-1890c2a1c46c security.access.redhat.com
msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40372 [email protected] msrc.microsoft.com Vendor Advisory
access.redhat.com/security/cve/CVE-2026-40372 0b0ca135-0b70-47e7-9f44-1890c2a1c46c access.redhat.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Additional Advisory Data

SourceTimeEvent
ADP2026-04-21T20:01:18.286ZReported to Red Hat.
ADP2026-04-21T19:20:50.215ZMade public.
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