CVE-2026-44807
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedUse after free in Windows DWM Core Library allows an authorized attacker to elevate privileges locally.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · moderate confidenceA use-after-free vulnerability exists in the Windows DWM Core Library (Desktop Window Manager). This memory corruption flaw allows a locally authenticated attacker to manipulate memory after it has been freed, potentially achieving elevated privileges on the affected system.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data< 10.0.28000.2269CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Local
- Complexity
- Low
- Privileges
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Check Windows 11 build versionRun 'winver' or 'systeminfo | findstr /B /C:"OS Version"' to obtain the full build numberAffected if Build is below 10.0.28000.2269 (the version where the fix was applied)
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Verify Windows 11 26h1 editionCheck if the system is running Windows 11 version 26h1 by examining the build information from the previous stepAffected if Running Windows 11 26h1 with build version below 10.0.28000.2269
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Confirm DWM service is runningRun 'Get-Process dwm' or check the Desktop Window Manager (UxSHost) service status via 'services.msc'Affected if The DWM process is active, as the vulnerability resides in the DWM Core Library
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Check DWM Core Library file versionLocate dwmcore.dll (typically in C:\Windows\System32\) and inspect its file version property via right-click Properties or using 'Get-Item dwmcore.dll | select VersionInfo' in PowerShellAffected if The dwmcore.dll version is lower than the fixed build 28000.2269, indicating the vulnerable code path is present
User is affected if running Windows 11 26h1 with a build number below 10.0.28000.2269 and the DWM service is active with an unpatched dwmcore.dll library.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
dbcve · scoped10.0.28000.2269
Apply Microsoft security updates immediately upon release. Until then, limit local user access to trusted personnel only and monitor for privilege escalation attempts.
Windows 11 26h1 version 10.0.28000.2269 or later
- Open Settings app on Windows 11
- Navigate to Windows Update (Settings > Windows Update)
- Click 'Check for updates' to download and install the latest security updates
- Alternatively, manually verify your version by opening Run (Win+R), typing 'winver', and checking if the build number is 10.0.28000.2269 or higher
- If the update is not available yet, ensure your system is set to receive automatic updates and check periodically until the patch is released
- After updating, confirm the version by running 'winver' again to verify the installation
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation2.0 h
- Implementation1.0 h
- Testing3.0 h
- Review / QA2.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $2,224.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-44807 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2026-44807 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
- No spam, self-promotion, credentials, or personal data