Improper access control in Windows and Windows Server - CVE-2026-49783
Published: July 17, 2026
Vulnerability identifier: #VU137967
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-49783
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 bypass a security feature.
The vulnerability exists due to improper access control in Windows Secure Boot when performing security checks for standard boot conditions. A local user can exploit the flawed security check to bypass a security feature.
The vulnerability could allow Secure Boot to be bypassed.
How to mitigate CVE-2026-49783
Install security update from vendor's website.