Improper Authentication in Windows and Windows Server - CVE-2026-50365
Published: July 17, 2026
Vulnerability identifier: #VU138038
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:A/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-50365
CWE-ID: CWE-287
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 attacker to escalate privileges.
The vulnerability exists due to improper authentication in Windows RPC API when a user actively connects to the affected server and runs a specific command. A remote attacker can send a specially crafted command over an adjacent network to escalate privileges.
Successful exploitation could result in SYSTEM privileges. User interaction is required to connect to the server and run the command.
How to mitigate CVE-2026-50365
Install security update from vendor's website.