---
title: "CVE-2026-20805: Microsoft Windows Information Disclosure Vulnerability"
url: https://erroneo.us/security/cve/CVE-2026-20805/
description: "CVE-2026-20805 (Microsoft Windows): Exploited in the wild (CISA KEV). Exposure of sensitive information to an unauthorized actor in Desktop Windows Manager…"
type: vulnerability-record
section: "Security Digest"
date_published: 2026-01-13
date_modified: 2026-07-30
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-20805"
kev: true
cvss: 5.5
epss: 0.07463
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2026-20805: Microsoft Windows Information Disclosure Vulnerability

**Signal:** Exploited: patch now if you run it. CISA has confirmed exploitation in the wild. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- Yes, if you run Microsoft Windows. CISA added this CVE to its Known Exploited Vulnerabilities catalog on 2026-01-13, which means there is reliable evidence of exploitation in the wild. US federal agencies must remediate by 2026-02-03 ; treat that as the outer limit, not the target.
- EPSS 7.5% , percentile 94: FIRST’s model estimates a 7.5% chance of exploitation activity in the next 30 days, higher than 94% of all scored CVEs (elevated). EPSS is a probability, not a verdict.
- Needs local access needed. Lower urgency for most teams unless an attacker could already run code on the machine.

## What it is

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

## Affected products (CVE record)

- Microsoft Windows 10 Version 1607: 10.0.14393.0 < 10.0.14393.8783
- Microsoft Windows 10 Version 1809: 10.0.17763.0 < 10.0.17763.8276
- Microsoft Windows 10 Version 21H2: 10.0.19044.0 < 10.0.19044.6809
- Microsoft Windows 10 Version 22H2: 10.0.19045.0 < 10.0.19045.6809
- Microsoft Windows 11 version 23H2: 10.0.22631.0 < 10.0.22631.6491
- Microsoft Windows 11 Version 23H2: 10.0.22631.0 < 10.0.22631.6491
- Microsoft Windows 11 Version 24H2: 10.0.26100.0 < 10.0.26100.7623
- Microsoft Windows 11 Version 25H2: 10.0.26200.0 < 10.0.26200.7623
- Microsoft Windows Server 2012: 6.2.9200.0 < 6.2.9200.25868
- Microsoft Windows Server 2012 (Server Core installation): 6.2.9200.0 < 6.2.9200.25868

## Severity

- microsoft CVSS 3.1: 5.5 `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`

## Exploitation

- CISA KEV: added 2026-01-13; federal due date 2026-02-03. Known ransomware use: Unknown.
- 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.
- CISA SSVC assessment: exploitation active , automatable no , technical impact partial .
- FIRST EPSS (model of 2026-10-21): 7.46% probability of exploitation activity in the next 30 days; percentile 94.

## Sources

- [Desktop Window Manager Information Disclosure Vulnerability](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20805)
- [Listed in CISA KEV notes (msrc.microsoft.com)](https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2026-20805)
- [CVE.org record CVE-2026-20805](https://www.cve.org/CVERecord?id=CVE-2026-20805)
- [NVD entry CVE-2026-20805](https://nvd.nist.gov/vuln/detail/CVE-2026-20805)
- [CISA Known Exploited Vulnerabilities catalog entry](https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-20805)

---
Source page: https://erroneo.us/security/cve/CVE-2026-20805/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt