Link following in Windows and Windows Server - CVE-2026-49791
Published: July 17, 2026
Vulnerability identifier: #VU137972
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-49791
CWE-ID: CWE-59
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 link resolution before file access in Windows Routing and Remote Access Service (RRAS) when accessing files through links. A local user can exploit link following to escalate privileges.
Successful exploitation could result in SYSTEM privileges.
How to mitigate CVE-2026-49791
Install security update from vendor's website.