Improper access control in Windows Server - CVE-2026-0386
Published: January 13, 2026
Vulnerability identifier: #VU121229
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-0386
CWE-ID: CWE-284
Exploitation vector: Adjecent network
Exploit availability:
No public exploit available
Vendor: Microsoft
Affected software:
Windows Server
Windows Server
Detailed vulnerability description
The vulnerability allows a remote attacker to gain unauthorized access to otherwise restricted functionality.
The vulnerability exists due to improper access restrictions in Windows Deployment Services. A remote attacker on the local network can bypass implemented security restrictions and execute arbitrary code on the system.
How to mitigate CVE-2026-0386
Install updates from vendor's website.