#VU122572 Input validation error in Windows and Windows Server - CVE-2026-21247

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Main Vulnerability Database Vulnerabilities #VU122572

#VU122572 Input validation error in Windows and Windows Server - CVE-2026-21247

Published: February 10, 2026


Vulnerability identifier: #VU122572
Vulnerability risk: Medium
CVSSv4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-21247
CWE-ID: CWE-20
Exploitation vector: Local access
Exploit availability: No public exploit available
Vulnerable software:
Windows
Windows Server
Software vendor:
Microsoft

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to insufficient validation of user-supplied input in Windows Hyper-V. A remote user can trick a victim to load a specially crafted file and execute arbitrary code on the system.


Remediation

Install updates from vendor's website.

External links