Improper access control in Windows and Windows Server - CVE-2026-49805
Published: July 17, 2026
Vulnerability identifier: #VU137980
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-49805
CWE-ID: CWE-284
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Microsoft
Affected software:
Windows
Windows Server
Windows
Windows Server
Detailed vulnerability description
The vulnerability allows a local user to escalate privileges.
The vulnerability exists due to improper access control in Windows Win32K when handling local access to privileged functionality. A local user can exploit the access control weakness to escalate privileges.
Successful exploitation can lead to SYSTEM privileges. Exploitation requires preparing the target environment to improve reliability.
How to mitigate CVE-2026-49805
Install security update from vendor's website.