.NET Framework
CVE-2026-108398 — .NET Framework Security Feature Bypass Vulnerability
Executive Summary
Untrusted search path in .NET Framework allows an authorized attacker to bypass a security feature locally.
Overview
8.8
CVSS HIGH
Important
MS Severity
Not Exploited
MS Exploit Status
Less Likely
MS Exploit Likelihood
CVSS Vector
ATTACK VECTOR
Local
ATTACK COMPLEXITY
Low
PRIVILEGES REQUIRED
Low
USER INTERACTION
None
SCOPE
Changed
CONFIDENTIALITY
High
INTEGRITY
High
AVAILABILITY
High
EXPLOIT CODE MATURITY
Unproven
REMEDIATION LEVEL
Official Fix
REPORT CONFIDENCE
Confirmed
Temporal Score: 7.7
EPSS Score
No EPSS score available for this CVE.
View on FIRST.orgAffected Products
24 affected products
| Product | KB Article | Severity | Impact | Restart Required |
|---|---|---|---|---|
| Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 on Windows 10 version 1607 | 5126868 (Security Update) |
Important | Security Feature Bypass | Maybe |
| Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2016 | 5126868 (Security Update) |
Important | Security Feature Bypass | Maybe |
| Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2019 | 5127666 (Security Update) |
Important | Security Feature Bypass | Maybe |
| Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 version 1809 | 5127666 (Security Update) |
Important | Security Feature Bypass | Maybe |
| Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 version 1809 | 5127685 (Security Update) |
Important | Security Feature Bypass | Maybe |
| Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 version 21H2 | 5127683 (Security Update) |
Important | Security Feature Bypass | Maybe |
| Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 version 22H2 | 5127683 (Security Update) |
Important | Security Feature Bypass | Maybe |
| Microsoft .NET Framework 3.5 AND 4.8 on Windows Server 2019 | 5127685 (Security Update) |
Important | Security Feature Bypass | Maybe |
| Microsoft .NET Framework 3.5 AND 4.8 on Windows Server 2022 | 5127687 (Security Update) |
Important | Security Feature Bypass | Maybe |
| Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 10 version 21H2 | 5127689 (Security Update) |
Important | Security Feature Bypass | Maybe |
| Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 10 version 22H2 | 5127689 (Security Update) |
Important | Security Feature Bypass | Maybe |
| Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 version 23H2 | 5127692 (Security Update) |
Important | Security Feature Bypass | Maybe |
| Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 version 24H2 | 5127690 (Security Update) |
Important | Security Feature Bypass | Maybe |
| Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 version 25H2 | 5127690 (Security Update) |
Important | Security Feature Bypass | Maybe |
| Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 version 26H2 | 5127694 (Security Update) |
Important | Security Feature Bypass | Maybe |
| Microsoft .NET Framework 3.5 AND 4.8.1 on Windows Server 2022 | 5127693 (Security Update) |
Important | Security Feature Bypass | Maybe |
| Microsoft .NET Framework 3.5 AND 4.8.1 on Windows Server 2025 | 5127690 (Security Update) |
Important | Security Feature Bypass | Maybe |
| Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2012 | 5127667 (Security Update) |
Important | Security Feature Bypass | Maybe |
| Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2012 R2 | 5127668 (Security Update) |
Important | Security Feature Bypass | Maybe |
| Microsoft .NET Framework 4.8 on Windows 10 version 1607 | 5127684 (Security Update) |
Important | Security Feature Bypass | Maybe |
| Microsoft .NET Framework 4.8 on Windows Server 2012 | 5127686 (Security Update) |
Important | Security Feature Bypass | Maybe |
| Microsoft .NET Framework 4.8 on Windows Server 2012 R2 | 5127688 (Security Update) |
Important | Security Feature Bypass | Maybe |
| Microsoft .NET Framework 4.8 on Windows Server 2016 | 5127684 (Security Update) |
Important | Security Feature Bypass | Maybe |
| Microsoft .NET Framework 4.8.1 on Windows 11 version 26H1 | 5127691 (Security Update) |
Important | Security Feature Bypass | Maybe |
Patches
16 patches
| Article | Type | Restart |
|---|---|---|
5126868 |
Security Update | Maybe |
5127666 |
Security Update | Maybe |
5127685 |
Security Update | Maybe |
5127683 |
Security Update | Maybe |
5127687 |
Security Update | Maybe |
5127689 |
Security Update | Maybe |
5127692 |
Security Update | Maybe |
5127690 |
Security Update | Maybe |
5127694 |
Security Update | Maybe |
5127693 |
Security Update | Maybe |
5127667 |
Security Update | Maybe |
5127668 |
Security Update | Maybe |
5127684 |
Security Update | Maybe |
5127686 |
Security Update | Maybe |
5127688 |
Security Update | Maybe |
5127691 |
Security Update | Maybe |
Exploits & PoC
No public exploit or PoC has been linked for this CVE yet. When available, references are sourced from public repositories and may be unverified or non-functional — review carefully before use.
Detection Rules
No public Sigma or Nuclei detection rule has been mapped to this CVE yet. Coverage is concentrated on exploited / high-profile vulnerabilities; check SigmaHQ for updates.
Acknowledgments
James Forshaw with Google Project Zero
References
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