CVE-2026-42896Important

Windows DWM Core Library Elevation of Privilege Vulnerability

MSRC advisory NVD CVE.org

Assessment

Integer overflow or wraparound in Windows DWM Core Library allows an authorized attacker to elevate privileges locally.

Severity: Important
CVSS base score: 7.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
Impact: Elevation of Privilege
EPSS, next 30 days: 0.3%Higher than 24.1% of scored CVEs · FIRST model run 29 Sep 2026 · about EPSS
Public exploit code: No Nuclei template lists it
Exploitability: Exploitation Less Likely
Publicly disclosed: No
Customer action: Required: apply the update
Component: Windows DWM Core Library
Weakness: CWE-190: Integer Overflow or Wraparound
Issued by: Microsoft
Published: 12 May 2026 · May 2026
Last revised: 12 May 2026

5 KBs

KB	Type	Restart	Applies to	Other CVEs
KB5087423	Security Hotpatch Update	Required	Windows Server 2025, Windows Server 2025 (Server Core installation)	All CVEs in KB5087423
KB5087539	Security Update	Required	Windows Server 2025, Windows Server 2025 (Server Core installation)	All CVEs in KB5087539
KB5089466	Security Hotpatch Update	Required	Windows 11 Version 24H2 for ARM64-based Systems, Windows 11 Version 24H2 for x64-based Systems, Windows 11 Version 25H2 for ARM64-based Systems and 1 more	All CVEs in KB5089466
KB5089548	Security Update	Required	Windows 11 Version 26H1 for ARM64-based Systems, Windows 11 version 26H1 for x64-based Systems	All CVEs in KB5089548
KB5089549	Security Update	Required	Windows 11 Version 24H2 for ARM64-based Systems, Windows 11 Version 24H2 for x64-based Systems, Windows 11 Version 25H2 for ARM64-based Systems and 1 more	All CVEs in KB5089549

8 affected products