Relative Path Traversal in Windows and Windows Server - CVE-2026-50426
Published: July 17, 2026
Vulnerability identifier: #VU138039
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:A/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-50426
CWE-ID: CWE-23
Exploitation vector: Adjecent network
Exploit availability:
No public exploit available
Vendor: Microsoft
Affected software:
Windows
Windows Server
Windows
Windows Server
Detailed vulnerability description
The vulnerability allows a remote privileged user to execute code.
The vulnerability exists due to relative path traversal in DNS Server when processing crafted path input over an adjacent network. A remote privileged user can supply a crafted relative path to execute code.
Exploitation is limited to systems on the same network segment, such as the same network switch or virtual network.
How to mitigate CVE-2026-50426
Install security update from vendor's website.