How severe is CVE-2026-20805?

CVE-2026-20805 has a CVSS 3.1 base score of 5.5 (MEDIUM). EPSS estimates a 7.5% probability of exploitation in the next 30 days. It is listed in the CISA Known Exploited Vulnerabilities catalog.

CVE-2026-20805: Desktop Window Manager Information Disclosure

CISA Known Exploited Vulnerabilities

Microsoft Windows Information Disclosure Vulnerability is confirmed as actively exploited and is listed in the CISA KEV catalog.

Added to KEV

2026-01-13

Remediation due

2026-02-03

Required action
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

CISA notes
https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2026-20805 ; https://nvd.nist.gov/vuln/detail/CVE-2026-20805

Description

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

Severity

CVSS 3.1 · CNA5.5 MEDIUM

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

SSVC · CISA-ADP

Exploitationactive

Automatableno

Technical impactpartial

Exploitation Context

as of October 17, 2026

All KEV statistics→

CISA added CVE-2026-20805 to the KEV catalog on the day its CVE record was published. The median for entries added in 2026 so far is 14 days.
It is one of 391 Microsoft entries in the CISA KEV catalog, and one of 40 added in 2026.
Its current EPSS score (7.5%) is higher than that of 23% of CISA KEV entries.

Affected Products

Vendor	Product	Affected versions
Microsoft	Microsoft Windows 10 Version 1607	10.0.14393.0 to <10.0.14393.8783
Microsoft	Microsoft Windows 10 Version 1809	10.0.17763.0 to <10.0.17763.8276
Microsoft	Microsoft Windows 10 Version 21H2	10.0.19044.0 to <10.0.19044.6809
Microsoft	Microsoft Windows 10 Version 22H2	10.0.19045.0 to <10.0.19045.6809
Microsoft	Microsoft Windows 11 version 23H2	10.0.22631.0 to <10.0.22631.6491
Microsoft	Microsoft Windows 11 Version 23H2	10.0.22631.0 to <10.0.22631.6491
Microsoft	Microsoft Windows 11 Version 24H2	10.0.26100.0 to <10.0.26100.7623
Microsoft	Microsoft Windows 11 Version 25H2	10.0.26200.0 to <10.0.26200.7623
Microsoft	Microsoft Windows Server 2012	6.2.9200.0 to <6.2.9200.25868
Microsoft	Microsoft Windows Server 2012 (Server Core installation)	6.2.9200.0 to <6.2.9200.25868
Microsoft	Microsoft Windows Server 2012 R2	6.3.9600.0 to <6.3.9600.22968
Microsoft	Microsoft Windows Server 2012 R2 (Server Core installation)	6.3.9600.0 to <6.3.9600.22968
Microsoft	Microsoft Windows Server 2016	10.0.14393.0 to <10.0.14393.8783
Microsoft	Microsoft Windows Server 2016 (Server Core installation)	10.0.14393.0 to <10.0.14393.8783
Microsoft	Microsoft Windows Server 2019	10.0.17763.0 to <10.0.17763.8276
Microsoft	Microsoft Windows Server 2019 (Server Core installation)	10.0.17763.0 to <10.0.17763.8276
Microsoft	Microsoft Windows Server 2022	10.0.20348.0 to <10.0.20348.4648
Microsoft	Microsoft Windows Server 2022, 23H2 Edition (Server Core installation)	10.0.25398.0 to <10.0.25398.2092
Microsoft	Microsoft Windows Server 2025	10.0.26100.0 to <10.0.26100.32230
Microsoft	Microsoft Windows Server 2025 (Server Core installation)	10.0.26100.0 to <10.0.26100.32230

References

1 Links

Vendor advisories

Desktop Window Manager Information Disclosure Vulnerability

Record Details

Published

2026-01-13

Last updated

2026-07-30

Assigner (CNA)

microsoft

Credited to

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Tool categories

Application Security Tools Data Security Software

CVE record data © The MITRE Corporation, used under the CVE Terms of Use. Exploited-in-the-wild data from the CISA Known Exploited Vulnerabilities catalog (CC0). Exploit prediction scores by FIRST EPSS (first.org/epss). This site is not endorsed or certified by MITRE, NVD, CISA, or FIRST.

CVE-2026-20805