Summary
Impact: Information Disclosure. Microsoft rating: Important. Exploited according to Microsoft — Exploitation Detected. Customer action: Required.
Details
What type of information could be disclosed by this vulnerability?
The type of information that could be disclosed if an attacker successfully exploited this vulnerability is a section address from a remote ALPC port which is user-mode memory.
Security updates
10.0.17763.8276 — https://support.microsoft.com/help/5073723
10.0.20348.4648 — https://support.microsoft.com/help/5073457
10.0.19044.6809 — https://support.microsoft.com/help/5073724
10.0.26100.32230 — https://support.microsoft.com/en-us/topic/a6021fd2-b3b7-45a7-b68e-35c28a2a77da
10.0.26200.7623 — https://support.microsoft.com/help/5074109
10.0.22631.6491 — https://support.microsoft.com/help/5073455
10.0.25398.2092 — https://support.microsoft.com/help/5073450
10.0.14393.8783 — https://support.microsoft.com/help/5073722
6.2.9200.25868 — https://support.microsoft.com/help/5073698
6.3.9600.22968 — https://support.microsoft.com/help/5073696
Vulnerabilities 1
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Medium 5.5
Desktop Window Manager Information Disclosure Vulnerability
Exposure of sensitive information to an unauthorized actor in Desktop Windows Manager allows an authorized attacker to disclose information locally.
KEV Jan 13, 2026
Revision history
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#4
Updated the build numbers. This is an informational update only.
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#3
Updated the build numbers. This is an informational update only.
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#2
Updated the build numbers. This is an informational update only.
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#1
Information published.
References
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CVE-2026-20805 Desktop Window Manager Information Disclosure Vulnerability - HTML
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20805
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Microsoft Exploitability Index
https://www.microsoft.com/en-us/msrc/exploitability-index?rtc=1
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Microsoft Support Lifecycle
https://support.microsoft.com/lifecycle
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Common Vulnerability Scoring System
https://www.first.org/cvss