Microsoft Windows Desktop Window Manager Information Disclosure Vulnerability
CVE-2026-20805 is an information disclosure vulnerability in Microsoft Windows Desktop Window Manager (DWM). According to the provided content, the flaw allows a local, authorized/authenticated attacker to disclose sensitive information by leaking a section address from a remote ALPC port residing in user-mode memory. Public reporting in the supplied material consistently describes the issue as exposing user-mode memory address information rather than directly enabling code execution. The vulnerability affects multiple supported Windows client and server releases, including Windows 10, Windows 11, and Windows Server versions listed in the January 2026 updates.
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Impact, mitigation & remediation
What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
Impact
What an attacker gets, and what they’ve been doing with it.
Mitigation
If you can’t patch tonight, do this now.
Remediation
Patch, then assume compromise.
Exploits
No valid public exploits. Mallory filtered out 5 candidates as fakes, detection scripts, or README-only repos.
All candidate exploits were filtered out by Mallory's validation.
Affected products & vendors
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
Recent activity
109 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A DWM information disclosure vulnerability mentioned only as another flaw patched in the same KB update.
A previously exploited Desktop Window Manager information disclosure vulnerability referenced for historical context as part of a broader pattern of DWM exploitation.
Microsoft vulnerability (type/product not specified in the provided content snippet) reported as actively exploited in the wild.
Windows Desktop Window Manager (DWM) information disclosure that leaks a user-mode memory address via ALPC, likely used to aid exploit chains (e.g., bypassing mitigations) rather than as a standalone exploit.
The version that knows your environment.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.