Elevation of Privilege Vulnerability in Windows DWM Core Library
CVE-2026-42896

7.8HIGH

Key Information:

Vendor

Microsoft
Status
Windows 11 Version 24h2
Windows 11 Version 25h2
Windows 11 Version 26h1
Windows Server 2025
Vendor
CVE Published:
12 May 2026

What is CVE-2026-42896?

An integer overflow vulnerability in the Windows DWM (Desktop Window Manager) Core Library permits a local attacker, with authorized access, to exploit this weakness to gain elevated privileges. This could allow an unauthorized user to perform restricted operations on the system, thereby increasing the risk of system compromise and data exposure.

Affected Version(s)

Windows 11 Version 24H2 ARM64-based Systems 10.0.26100.0 < 10.0.26100.8457

Windows 11 Version 25H2 ARM64-based Systems 10.0.26200.0 < 10.0.26200.8457

Windows 11 version 26H1 ARM64-based Systems 10.0.28000.0 < 10.0.28000.2113

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE...
vendor-advisorypatch

CVSS V3.1

Score:
7.8
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Local
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.