VulnerabilityAnalyzed

CVE-2026-20805

Microsoft Windows Information Disclosure Vulnerability

KEVMEDIUM 5.5EPSS 5.19%

Does this matter?

Known to be exploited in the wild (CISA KEV, CISA remediation deadline 3 February 2026). Treat as an emergency change: patch or isolate now, then hunt for prior compromise.

Description

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

CVSS 3.1: 5.5 MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
EPSS: 5.19% probability · 92th percentile
CISA KEV: Listed 13 January 2026 · due 3 February 2026
Weakness: CWE-200
Affected: microsoft/windows 10 1607 · microsoft/windows 10 1809 · microsoft/windows 10 21h2 · microsoft/windows 10 22h2 · microsoft/windows 11 23h2 · microsoft/windows 11 24h2 · microsoft/windows 11 25h2 · microsoft/windows server 2012 · microsoft/windows server 2016 · microsoft/windows server 2019 · microsoft/windows server 2022 · microsoft/windows server 2022 23h2 · microsoft/windows server 2025
Source: secure@microsoft.com

CISA notes

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2026-20805 ; https://nvd.nist.gov/vuln/detail/CVE-2026-20805

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20805Vendor Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-20805US Government Resource

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.