CVE-2026-108398 .NET Framework - Authentication Bypass

.NET Framework contains a security feature bypass caused by untrusted search path, letting authorized local attackers bypass security features, exploit requires local access with authorization.

CVSS base score 8.8 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
EPSS
0.47% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Authentication Bypass
Impact
Privilege Escalation
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Published
13 October 2026
Updated
15 October 2026
Weakness
CWE-426

Vendor fix

Update to the latest .NET Framework version.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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