CVE-2026-108398: .NET Framework Security Feature Bypass Vulnerability
Untrusted search path in .NET Framework allows an authorized attacker to bypass a security feature locally.
- Published by source
- 2026-10-13
- First seen by Reality Radar
- 2026-10-22
- Last verified
- 2026-10-22
Affected
- Manufacturer
- Microsoft
- Products
- Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 on Windows 10 version 1607 Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2016 Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2019 Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 version 1809 Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 version 1809 Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 version 21H2 Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 version 22H2 Microsoft .NET Framework 3.5 AND 4.8 on Windows Server 2019 Microsoft .NET Framework 3.5 AND 4.8 on Windows Server 2022 Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2012 Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2012 R2 Microsoft .NET Framework 4.8 on Windows 10 version 1607 Microsoft .NET Framework 4.8 on Windows Server 2012 Microsoft .NET Framework 4.8 on Windows Server 2012 R2 Microsoft .NET Framework 4.8 on Windows Server 2016 Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 10 version 21H2 Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 10 version 22H2 Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 version 24H2 Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 version 25H2 Microsoft .NET Framework 3.5 AND 4.8.1 on Windows Server 2025
- CPE
- cpe:2.3:a:microsoft:.net_framework:3.5:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:.net:4.7.2:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:.net:4.8:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:.net:4.8.1:*:*:*:*:*:*:*
cpe:2.3:a:microsoft:.net_framework:4.8.1:*:*:*:*:*:*:*
Whether your exact unit is affected depends on the model, serial number and region in the official notice.
What the official notice says
Risk: Important — Security Feature Bypass
Remedy / actions:
- Install the security update: https://support.microsoft.com/help/5126868
Is this affecting you?
Add what you own or use and Reality Radar will tell you when official changes match it — with evidence and next steps.
Sources
- Microsoft Security Update Guide (MSRC) Tier A · official published 2026-10-13
Evidence ledger
Every piece of evidence we store is appended to a public hash chain, so later edits are detectable. Anyone can re-verify it.
| Entry | Kind | Observed | Evidence hash | Entry hash |
|---|---|---|---|---|
| #112 | new | 2026-10-22 | 810370226c05…5062cf | 9a999799dc01…32ff3f |
Chain head: #1076 8ad5adc30b9b…88ce20