CVE-2026-20805 (GCVE-0-2026-20805)

Vulnerability from cvelistv5 – Published: 2026-01-13 17:56 – Updated: 2026-04-01 13:48
VLAI CISA KEVIntel
Title
Desktop Window Manager Information Disclosure Vulnerability
Summary
Exposure of sensitive information to an unauthorized actor in Desktop Windows Manager allows an authorized attacker to disclose information locally.
Severity
5.5 (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
Exploitation: active Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-200 - Exposure of Sensitive Information to an Unauthorized Actor
Assigner
References
Impacted products
Vendor Product Version
Microsoft Windows 10 Version 1607 Affected: 10.0.14393.0 , < 10.0.14393.8783 (custom)
Create a notification for this product.
Microsoft Windows 10 Version 1809 Affected: 10.0.17763.0 , < 10.0.17763.8276 (custom)
Create a notification for this product.
Microsoft Windows 10 Version 21H2 Affected: 10.0.19044.0 , < 10.0.19044.6809 (custom)
Create a notification for this product.
Microsoft Windows 10 Version 22H2 Affected: 10.0.19045.0 , < 10.0.19045.6809 (custom)
Create a notification for this product.
Microsoft Windows 11 version 22H3 Affected: 10.0.22631.0 , < 10.0.22631.6491 (custom)
Create a notification for this product.
Microsoft Windows 11 Version 23H2 Affected: 10.0.22631.0 , < 10.0.22631.6491 (custom)
Create a notification for this product.
Microsoft Windows 11 Version 24H2 Affected: 10.0.26100.0 , < 10.0.26100.7623 (custom)
Create a notification for this product.
Microsoft Windows 11 Version 25H2 Affected: 10.0.26200.0 , < 10.0.26200.7623 (custom)
Create a notification for this product.
Microsoft Windows Server 2012 Affected: 6.2.9200.0 , < 6.2.9200.25868 (custom)
Create a notification for this product.
Microsoft Windows Server 2012 (Server Core installation) Affected: 6.2.9200.0 , < 6.2.9200.25868 (custom)
Create a notification for this product.
Microsoft Windows Server 2012 R2 Affected: 6.3.9600.0 , < 6.3.9600.22968 (custom)
Create a notification for this product.
Microsoft Windows Server 2012 R2 (Server Core installation) Affected: 6.3.9600.0 , < 6.3.9600.22968 (custom)
Create a notification for this product.
Microsoft Windows Server 2016 Affected: 10.0.14393.0 , < 10.0.14393.8783 (custom)
Create a notification for this product.
Microsoft Windows Server 2016 (Server Core installation) Affected: 10.0.14393.0 , < 10.0.14393.8783 (custom)
Create a notification for this product.
Microsoft Windows Server 2019 Affected: 10.0.17763.0 , < 10.0.17763.8276 (custom)
Create a notification for this product.
Microsoft Windows Server 2019 (Server Core installation) Affected: 10.0.17763.0 , < 10.0.17763.8276 (custom)
Create a notification for this product.
Microsoft Windows Server 2022 Affected: 10.0.20348.0 , < 10.0.20348.4648 (custom)
Create a notification for this product.
Microsoft Windows Server 2022, 23H2 Edition (Server Core installation) Affected: 10.0.25398.0 , < 10.0.25398.2092 (custom)
Create a notification for this product.
Microsoft Windows Server 2025 Affected: 10.0.26100.0 , < 10.0.26100.32230 (custom)
Create a notification for this product.
Microsoft Windows Server 2025 (Server Core installation) Affected: 10.0.26100.0 , < 10.0.26100.32230 (custom)
Create a notification for this product.
Date Public
2026-01-13 16:00
CISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: e3ab54db-4e6a-4bdd-831a-e3622881d712

Vulnerability ID: CVE-2026-20805

Status: Confirmed

Status Updated: 2026-01-13 00:00 UTC

Exploited: Yes

Timestamps
First Seen: 2026-01-13
Asserted: 2026-01-13
Scope
Notes: KEV entry: Microsoft Windows Information Disclosure Vulnerability | Affected: Microsoft / Windows | Description: Microsoft Windows Desktop Windows Manager contains an information disclosure vulnerability that allows an authorized attacker to disclose information locally. | 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 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2026-20805 ; https://nvd.nist.gov/vuln/detail/CVE-2026-20805
Evidence

Type: Vendor Report

Signal: Successful Exploitation

Confidence: 80%

Source: cisa-kev

Details
Cwes CWE-200
Feed CISA Known Exploited Vulnerabilities Catalog
Product Windows
Due Date 2026-02-03
Date Added 2026-01-13
Vendorproject Microsoft
Vulnerabilityname Microsoft Windows Information Disclosure Vulnerability
Knownransomwarecampaignuse Unknown
References
Created: 2026-02-02 12:25 UTC | Updated: 2026-02-06 07:17 UTC
KEVIntel
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 7c8a32f4-f021-40d5-aa4e-568b637e420c

Vulnerability ID: CVE-2026-20805

Status: Confirmed

Status Updated: 2026-06-01 10:48 UTC

Exploited: Yes

Timestamps
First Seen: 2026-06-01
Asserted: 2026-06-01
Scope
Notes: KEVIntel entry: Desktop Window Manager Information Disclosure Vulnerability | Affected: Microsoft / Windows 10 Version 1607, Windows 10 Version 1809, Windows 10 Version 21H2, Windows 10 Version 22H2, Windows 11 version 22H3, Windows 11 Version 23H2, Windows 11 Version 24H2, Windows 11 Version 25H2, Windows Server 2012, Windows Server 2012 (Server Core installation), Windows Server 2012 R2, Windows Server 2012 R2 (Server Core installation), Windows Server 2016, Windows Server 2016 (Server Core installation), Windows Server 2019, Windows Server 2019 (Server Core installation), Windows Server 2022, Windows Server 2022, 23H2 Edition (Server Core installation), Windows Server 2025, Windows Server 2025 (Server Core installation) | CVSS: 5.5 (MEDIUM) | EPSS: 0.05028 | Used in malware: unknown | Not yet in CISA KEV: False
Evidence

Type: Public Report

Signal: Successful Exploitation

Confidence: 70%

Source: kevintel

Details
Feed KEVIntel (kevintel.com)
Title Desktop Window Manager Information Disclosure Vulnerability
Vendor Microsoft
Product Windows 10 Version 1607, Windows 10 Version 1809, Windows 10 Version 21H2, Windows 10 Version 22H2, Windows 11 version 22H3, Windows 11 Version 23H2, Windows 11 Version 24H2, Windows 11 Version 25H2, Windows Server 2012, Windows Server 2012 (Server Core installation), Windows Server 2012 R2, Windows Server 2012 R2 (Server Core installation), Windows Server 2016, Windows Server 2016 (Server Core installation), Windows Server 2019, Windows Server 2019 (Server Core installation), Windows Server 2022, Windows Server 2022, 23H2 Edition (Server Core installation), Windows Server 2025, Windows Server 2025 (Server Core installation)
Added Date 2026-06-01T10:48:47.515Z
Cvss Score 5.5
Epss Score 0.05028
Cvss Severity MEDIUM
Epss Percentile 0.91151
Used In Malware unknown
Ahead Of Cisa Kev 
{
  "count": 1,
  "unit": "day"
}
Not Yet In Cisa Kev False
References
Created: 2026-06-23 14:03 UTC | Updated: 2026-07-10 06:14 UTC
Show details on NVD website
To clipboard 

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      "notes": "https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2026-20805 ; https://nvd.nist.gov/vuln/detail/CVE-2026-20805",
      "product": "Windows",
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      "vendorProject": "Microsoft",
      "vulnerabilityName": "Microsoft Windows Information Disclosure Vulnerability"
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      "date": "2026-07-19",
      "epss": "0.05028",
      "percentile": "0.9131"
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      "product_status:known_not_affected": "1",
      "source": "Red Hat CSAF VEX",
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      "cveMetadata": "{\"cveId\": \"CVE-2026-20805\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-04-01T13:48:17.330Z\", \"dateReserved\": \"2025-12-03T05:54:20.371Z\", \"assignerOrgId\": \"f38d906d-7342-40ea-92c1-6c4a2c6478c8\", \"datePublished\": \"2026-01-13T17:56:08.339Z\", \"assignerShortName\": \"microsoft\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}