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CISA KEV · Known exploitedMedium

CVE-2026-20805

Microsoft Windows 10 Version 1607, Windows 10 Version 1809, Windows 10 Version 21H2

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

CVSS
5.5
EPSS
5.03%
91.4% percentile
CISA KEV
Listed
Published
2026.01.14
PRIORITY ASSESSMENT

Immediate review

CISA has listed this vulnerability in the Known Exploited Vulnerabilities catalog.

Known exploitationConfirmed by CISA KEV
Exploit probability5.03%
Technical severityCVSS 5.5

Vulnerability overview

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

Affected product and versions

Product
Microsoft Windows 10 Version 1607, Windows 10 Version 1809, Windows 10 Version 21H2
Affected versions
>= 10.0.14393.0 < 10.0.14393.8783, >= 10.0.17763.0 < 10.0.17763.8276, >= 10.0.19044.0 < 10.0.19044.6809, >= 10.0.19045.0 < 10.0.19045.6809, >= 10.0.22631.0 < 10.0.22631.6491, >= 10.0.26100.0 < 10.0.26100.7623, >= 10.0.26200.0 < 10.0.26200.7623, >= 6.2.9200.0 < 6.2.9200.25868, >= 6.3.9600.0 < 6.3.9600.22968, >= 10.0.20348.0 < 10.0.20348.4648, >= 10.0.25398.0 < 10.0.25398.2092, >= 10.0.26100.0 < 10.0.26100.32230, < 10.0.14393.8783, < 10.0.17763.8276, < 10.0.19044.6809, < 10.0.19045.6809, < 10.0.22631.6491, < 10.0.26100.7623, < 10.0.26200.7623, r2
Fixed versions
10.0.14393.8783, 10.0.17763.8276, 10.0.19044.6809, 10.0.19045.6809, 10.0.22631.6491, 10.0.26100.7623, 10.0.26200.7623, 10.0.20348.4648, 10.0.25398.2092

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
CISA 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.

Due date: 2026.02.03
  1. 1
    Identify

    Confirm that Microsoft Windows 10 Version 1607, Windows 10 Version 1809, Windows 10 Version 21H2 and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
CWE
CWE-200
KEV added
2026.01.13
Ransomware use
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