CVE-2026-21250

Published: Feb 10, 2026Modified: Jun 17, 2026

7.8

Vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Exploitability: 1.8 / Impact: 5.9

Source: secure@microsoft.com (Secondary)

Description

Untrusted pointer dereference in Windows HTTP.sys allows an authorized attacker to elevate privileges locally.

Affected (6)

Products: Microsoft: Windows 11 24h2, Windows 11 25h2, Windows Server 2022 23h2, Windows Server 2025

4 products

Windows 11 24h2

Windows 11 25h2

Windows Server 2022 23h2

Windows Server 2025

Configuration A

6 vulnerable

Vulnerable Software	Affected Versions
Microsoft Windows 11 24h2	Before 10.0.26100.7781
Microsoft Windows 11 24h2	Before 10.0.26100.7781
Microsoft Windows 11 25h2	Before 10.0.26200.7781
Microsoft Windows 11 25h2	Before 10.0.26200.7781
Microsoft Windows Server 2022 23h2	Before 10.0.25398.2149
Microsoft Windows Server 2025	Before 10.0.26100.32313

Related CWEs

Untrusted Pointer Dereference

The product obtains a value from an untrusted source, converts this value to a pointer, and dereferences the resulting pointer.

References (1)

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21250

Source: secure@microsoft.com

Vendor Advisory

Timeline

No history available yet.