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HIGH · 7.0

CVE-2026-26166

Double free in Windows Shell allows an authorized attacker to elevate privileges locally.

Vulnerability Description

Double free in Windows Shell allows an authorized attacker to elevate privileges locally.

CVSS Score

7.0

HIGH

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack Vector
LOCAL
Attack Complexity
HIGH
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH

Affected Products

VendorProductVersions
MicrosoftWindows 11 23H2< 10.0.22631.6936
MicrosoftWindows 11 24H2< 10.0.26100.8246
MicrosoftWindows 11 25H2< 10.0.26200.8246
MicrosoftWindows 11 26H1< 10.0.28000.1836
MicrosoftWindows Server 2022< 10.0.20348.5020
MicrosoftWindows Server 2022 23H2< 10.0.25398.2274
MicrosoftWindows Server 2025< 10.0.26100.32690

Related Weaknesses (CWE)

CWE-415

References

FAQ

What is CVE-2026-26166?

CVE-2026-26166 is a vulnerability with a CVSS score of 7.0 (HIGH). Double free in Windows Shell allows an authorized attacker to elevate privileges locally.

How severe is CVE-2026-26166?

CVE-2026-26166 has been rated HIGH with a CVSS base score of 7.0/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-26166?

Check the references section above for vendor advisories and patch information. Affected products include: Microsoft Windows 11 23H2, Microsoft Windows 11 24H2, Microsoft Windows 11 25H2, Microsoft Windows 11 26H1, Microsoft Windows Server 2022.