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Windows 10 1607Operating system · Microsoft

CVE-2026-27915

HIGH · 7.8 CVSS v3.1 Published 2026-04-14
Fix available
A fix is available. Upgrade to 10.0.14393.9060 / 10.0.17763.8644 or later.
See remediation →
80/100
Remediation priority · High
Zero-click

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 · unedited
Use after free in Windows Universal Plug and Play (UPnP) Device Host 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 confidence

A use-after-free vulnerability exists in the Windows Universal Plug and Play (UPnP) Device Host service. This memory corruption flaw allows a locally authorized attacker to exploit freed memory to elevate their privileges to higher integrity levels on the affected system.

MitigationApply Microsoft security patches for this vulnerability once available. Until then, restrict local user permissions and monitor for unusual UPnP service activity. Consider disabling UPnP if not required in the environment.

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
Windows 10 1607Operating system
Affected:< 10.0.14393.9060
Windows 10 1809Operating system
Affected:< 10.0.17763.8644
Windows 10 21h2Operating system
Affected:< 10.0.19044.7184
Windows 10 22h2Operating system
Affected:< 10.0.19045.7184
Windows 11 23h2Operating system
Affected:< 10.0.22631.6936
Windows 11 24h2Operating system
Affected:< 10.0.26100.8246
Windows 11 25h2Operating system
Affected:< 10.0.26200.8246
Windows 11 26h1Operating system
Affected:< 10.0.28000.1836

CVSS 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 checks

Work through these to decide whether this CVE applies to you.

  1. Check Windows build number
    Run 'winver' or 'systeminfo | findstr /B /C:"OS Name" /C:"OS Version"' to obtain the exact Windows build number
    Affected if Build number is lower than the affected thresholds for your Windows version (10.0.14393.9060, 10.0.17763.8644, 10.0.19044.7184, 10.0.19045.7184, 10.0.22631.6936, 10.0.26100.8246, 10.0.26200.8246, or 10.0.28000.1836)
  2. Identify Windows version branch
    Run 'ver' at command prompt or check System Properties to determine if you are on Windows 10 1607, 1809, 21h2, 22h2, or Windows 11 23h2, 24h2, 25h2, or 26h1
    Affected if Your specific Windows version branch build falls below the corresponding threshold listed for that release
  3. Verify UPnP Device Host service presence
    Run 'sc query upnphost' or check Services.msc for the 'UPnP Device Host' service
    Affected if The UPnP Device Host service exists on the system (vulnerability requires this service to be present)

You are affected if your Windows build number is below the threshold for your specific version AND the UPnP Device Host service is present on the system.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

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 · scoped
Upgrade available Upgrade to 10.0.14393.9060 / 10.0.17763.8644 / 10.0.19044.7184 or later
Fixed in 10.0.14393.906010.0.17763.864410.0.19044.7184
Interim mitigation

Apply Microsoft security patches for this vulnerability once available. Until then, restrict local user permissions and monitor for unusual UPnP service activity. Consider disabling UPnP if not required in the environment.

Recommended fix High confidence

Windows 10 1607: 10.0.14393.9060 or later | Windows 10 1809: 10.0.17763.8644 or later | Windows 10 21h2: 10.0.19044.7184 or later | Windows 10 22h2: 10.0.19045.7184 or later | Windows 11 23h2: 10.0.22631.6936 or later | Windows 11 24h2: 10.0.26100.8246 or later | Windows 11 25h2: 10.0.26200.8246 or

  1. Open Windows Update settings on the affected Windows system
  2. Check for and install the latest Windows security updates
  3. Verify the update includes the fix for CVE-2026-27915 by reviewing the installed KB article
  4. Restart the system if prompted to complete the installation
  5. Confirm the version matches or exceeds the fixed build number for your Windows version
Caveat Standard Windows security update risks apply - test critical applications before deploying broadly in enterprise environments

Generated from the published advisory — verify against the referenced sources before acting.

Fix this in Windows 10 1607 Scoped from the published advisory
  • Consultation3.0 h
  • Implementation1.0 h
  • Testing4.0 h
  • Review / QA2.0 h
10.0 hours of engineering $1,740
Get the upgrade done

An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $2,784.

Scan for this in your stack

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2026-27915 in production — separate from our analysis above.

No notes yet

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • 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