Untrusted search path in Microsoft .NET Framework - CVE-2026-108398
Published: October 13, 2026
Vulnerability identifier: #VU154363
CSH Severity: Low
CVSS v4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-108398
CWE-ID: CWE-426
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to bypass Windows Defender Application Control (WDAC) enforcement and execute code within a protected process.
The vulnerability exists due to an untrusted search path in .NET Framework when loading assemblies into a protected process. A local user can place a specially crafted .NET assembly on the affected system and register it for loading by a protected process to bypass Windows Defender Application Control (WDAC) enforcement and execute code within a protected process.
User interaction is not required.
Affected software
Microsoft .NET Framework
How to mitigate CVE-2026-108398
Install security update from vendor's website.
Microsoft .NET Framework - addressed in versions 2.0.50727.8987 AND 3.0.30729.8982 AND 4.7.4150.0, 2.0.50727.9073 AND 3.0.30729.9070 AND 4.8.4811.0, 2.0.50727.9188 AND 3.0.30729.9171 AND 4.8.4811.0, 2.0.50727.9188 AND 3.0.30729.9171 AND 4.8.9363.0, 4.7.4150.0, 4.8.4811.0