What is CVE-2026-20805?

CVE-2026-20805 is a medium-severity vulnerability in Microsoft Windows 10 Version 1607, classified under Information Disclosure. CVSS score: 5.5/10. Published 2026-01-13.

How severe is CVE-2026-20805?

Medium severity. CVSS v3 base score is 5.5 out of 10.

Is CVE-2026-20805 known to be exploited?

Yes. CVE-2026-20805 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2026-01-13), indicating it is being actively exploited.

Information disclosure in Microsoft Windows 10 Version 1607

CVE-2026-20805

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

Vulnerability class: Information Disclosure

EPSS: 0.030 (86.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). 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.

Affected products

Microsoft Windows 10 Version 1607 — versions 10.0.14393.0
Microsoft Windows 10 Version 1809 — versions 10.0.17763.0
Microsoft Windows 10 Version 21h2 — versions 10.0.19044.0
Microsoft Windows 10 Version 22h2 — versions 10.0.19045.0
Microsoft Windows 11 Version 22h3 — versions 10.0.22631.0
Microsoft Windows 11 Version 23h2 — versions 10.0.22631.0
Microsoft Windows 11 Version 24h2 — versions 10.0.26100.0
Microsoft Windows 11 Version 25h2 — versions 10.0.26200.0
Microsoft Windows Server 2012 — versions 6.2.9200.0
Microsoft Windows Server 2012 R2 — versions 6.3.9600.0

Weakness classification (CWE)

CWE-200 — Information Disclosure

CISA KEV (Known Exploited Vulnerabilities)

This CVE is on the CISA KEV catalog, added on 2026-01-13. CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.

BOD 22-01 due date: 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.

References

Desktop Window Manager Information Disclosure Vulnerability (vendor-advisory, patch)

Frequently asked questions

What is CVE-2026-20805?: CVE-2026-20805 is a medium-severity vulnerability in Microsoft Windows 10 Version 1607, classified under Information Disclosure. CVSS score: 5.5/10. Published 2026-01-13.
How severe is CVE-2026-20805?: Medium severity. CVSS v3 base score is 5.5 out of 10.
Is CVE-2026-20805 known to be exploited?: Yes. CVE-2026-20805 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2026-01-13), indicating it is being actively exploited.