.NET Framework Security Feature Bypass Vulnerability

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-108398
StatePUBLISHED
Assignermicrosoft
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-13 19:18:04 UTC
Updated2026-10-13 23:17:30 UTC
DescriptionUntrusted search path in .NET Framework allows an authorized attacker to bypass a security feature locally.

Risk And Classification

Primary CVSS: v3.1 8.8 HIGH from [email protected]

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

Problem Types: CWE-426 | CWE-426 CWE-426: Untrusted Search Path

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary8.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
3.1CNACVSS8.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Microsoft Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 affected 3.0.0.0 2.0.50727.8987 AND 3.0.30729.8982 AND 4.7.4150.0 custom Windows 10 version 1607, Windows Server 2016, Windows Server 2019
CNA Microsoft Microsoft .NET Framework 3.5 AND 4.7.2 affected 4.7.0 2.0.50727.9073 AND 3.0.30729.9070 AND 4.7.4150.0 custom Windows 10 version 1809
CNA Microsoft Microsoft .NET Framework 3.5 AND 4.8 affected 4.8.0 2.0.50727.9073 AND 3.0.30729.9070 AND 4.8.4811.0 custom Windows 10 version 1809, Windows 10 version 21H2, Windows 10 version 22H2, Windows Server 2019, Windows Server 2022
CNA Microsoft Microsoft .NET Framework 3.5 AND 4.8.1 affected 4.8.1 2.0.50727.9188 AND 3.0.30729.9171 AND 4.8.9363.0 custom Windows 10 version 21H2, Windows 10 version 22H2, Windows 11 version 23H2, Windows 11 version 24H2, Windows 11 version 25H2, Windows 11 version 26H2, Windows Server 2022, Windows Server 2025
CNA Microsoft Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 affected 4.7.0 4.7.4150.0 custom Windows Server 2012, Windows Server 2012 R2
CNA Microsoft Microsoft .NET Framework 4.8 affected 4.8.0 4.8.4811.0 custom Windows 10 version 1607, Windows Server 2012, Windows Server 2012 R2, Windows Server 2016
CNA Microsoft Microsoft .NET Framework 4.8.1 affected 4.8.0.0 4.8.9363.0 custom Windows 11 version 26H1

References

ReferenceSourceLinkTags
msrc.microsoft.com/update-guide/vulnerability/CVE-2026-108398 [email protected] msrc.microsoft.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

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