CVE-2026-20929

Published: Jan 13, 2026Modified: Jul 30, 2026

7.5

Vector

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

Exploitability: 1.6 / Impact: 5.9

Source: secure@microsoft.com (Secondary)

Description

Improper access control in Windows HTTP.sys allows an authorized attacker to elevate privileges over a network.

Affected (16)

Products: Microsoft: Windows 10 1607, Windows 10 1809, Windows 10 21h2, Windows 10 22h2, Windows 11 23h2, Windows Server 2008, Windows Server 2012, Windows Server 2016, Windows Server 2019, Windows Server 2022, Windows Server 2022 23h2

11 products

Windows 10 1607

Windows 10 1809

Windows 10 21h2

Windows 10 22h2

Windows 11 23h2

Windows Server 2008

Windows Server 2012

Windows Server 2016

Windows Server 2019

Windows Server 2022

Windows Server 2022 23h2

Configuration A

16 vulnerable

Vulnerable Software	Affected Versions
Microsoft Windows 10 1607	version < 10.0.14393.8783
Microsoft Windows 10 1607	version < 10.0.14393.8783
Microsoft Windows 10 1809	version < 10.0.17763.8276
Microsoft Windows 10 1809	version < 10.0.17763.8276
Microsoft Windows 10 21h2	version < 10.0.19044.6809
Microsoft Windows 10 22h2	version < 10.0.19045.6809
Microsoft Windows 11 23h2	version < 10.0.22631.6491
Microsoft Windows Server 2008	All versions
Microsoft Windows Server 2008	All versions
Microsoft Windows Server 2008	Version r2 sp1
Microsoft Windows Server 2012	All versions
Microsoft Windows Server 2012	Version r2
Microsoft Windows Server 2016	version < 10.0.14393.8783
Microsoft Windows Server 2019	version < 10.0.17763.8276
Microsoft Windows Server 2022	version < 10.0.20348.4648
Microsoft Windows Server 2022 23h2	version < 10.0.25398.2092

Related CWEs

Improper Access Control

The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor.

References (1)

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20929

Source: secure@microsoft.com

Vendor Advisory

Timeline

No history available yet.