CVE-2026-20805: Desktop Window Manager Information Disclosure Vulnerability

Overview

Severity

Medium (CVSS 5.5)

CVSS Vector

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

Category

Information Disclosure

Exploit Status

Actively Exploited

Exploitation Likelihood

Detected

Patch Tuesday

2026-Jan

Released

2026-01-13

Last Updated

2026-01-27

EPSS Score

3.74% (percentile: 88.0%)

CISA KEV

Listed — due 2026-02-03

Description

Exposure of sensitive information to an unauthorized actor in Desktop Windows Manager allows an authorized attacker to disclose information locally.

FAQ

What type of information could be disclosed by this vulnerability? The type of information that could be disclosed if an attacker successfully exploited this vulnerability is a section address from a remote ALPC port which is user-mode memory.

Known Exploits (1)

• Microsoft Windows Information Disclosure Vulnerability — added 2026-01-19T19:16:25Z

Detection & Weaponization (1 sources)

Maturity: Exploit

• GitHub PoC: 5 repositories

Affected Products (29)

Windows

• Windows 10 Version 1809 for 32-bit Systems
• Windows 10 Version 1809 for x64-based Systems
• Windows Server 2019
• Windows Server 2019 (Server Core installation)
• Windows Server 2022
• Windows Server 2022 (Server Core installation)
• Windows 10 Version 21H2 for 32-bit Systems
• Windows 10 Version 21H2 for ARM64-based Systems
• Windows 10 Version 21H2 for x64-based Systems
• Windows Server 2025 (Server Core installation)
• Windows 11 Version 25H2 for ARM64-based Systems
• Windows 11 Version 25H2 for x64-based Systems
• Windows 11 Version 23H2 for ARM64-based Systems
• Windows 11 Version 23H2 for x64-based Systems
• Windows Server 2022, 23H2 Edition (Server Core installation)
• Windows 11 Version 24H2 for ARM64-based Systems
• Windows 11 Version 24H2 for x64-based Systems
• Windows Server 2025
• Windows 10 Version 1607 for 32-bit Systems
• Windows 10 Version 1607 for x64-based Systems
• Windows Server 2016
• Windows Server 2016 (Server Core installation)

ESU

• Windows 10 Version 22H2 for x64-based Systems
• Windows 10 Version 22H2 for ARM64-based Systems
• Windows 10 Version 22H2 for 32-bit Systems
• Windows Server 2012
• Windows Server 2012 (Server Core installation)
• Windows Server 2012 R2
• Windows Server 2012 R2 (Server Core installation)

Security Updates (10)

• 5073723
• 5073457
• 5073724
• 5073379
• 5074109
• 5073455
• 5073450
• 5073722
• 5073698
• 5073696

Acknowledgments

Microsoft Threat Intelligence Center and Microsoft Security Response Center, Microsoft Threat Intelligence Center and Microsoft Security Response Center

Revision History

• 2026-01-13: Information published.
• 2026-01-20: Updated the build numbers. This is an informational update only.
• 2026-01-23: Updated the build numbers. This is an informational update only.
• 2026-01-27: Updated the build numbers. This is an informational update only.