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Windows 10 1809Operating system · Microsoft

CVE-2026-42979

HIGH · 7.8 CVSS v3.1 Published 2026-06-09
Fix available
A fix is available. Upgrade to 10.0.17763.8880 / 10.0.19044.7417 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
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Push Notifications 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 race condition vulnerability exists in Windows Push Notifications where concurrent execution leads to improper synchronization, allowing a locally authorized attacker to elevate privileges. The flaw allows manipulation of shared resources during notification processing to gain higher system access.

MitigationApply Microsoft security updates for Windows Push Notifications when available. Restrict local user privileges and monitor for unusual notification service behavior. Consider disabling push notifications if not required in high-security environments.

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 1809Operating system
Affected:< 10.0.17763.8880
Windows 10 21h2Operating system
Affected:< 10.0.19044.7417
Windows 10 22h2Operating system
Affected:< 10.0.19045.7417
Windows 11 23h2Operating system
Affected:< 10.0.22631.7219
Windows 11 24h2Operating system
Affected:< 10.0.26100.8655
Windows 11 25h2Operating system
Affected:< 10.0.26200.8655
Windows 11 26h1Operating system
Affected:< 10.0.28000.2269
Windows Server 2019Operating system
Affected:< 10.0.17763.8880

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
High
Privileges
Low
User interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/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. Identify Windows version and build number
    Run 'winver' or 'systeminfo | findstr /B /C:"OS Name" /C:"OS Version"' to obtain the exact Windows version and build number
    Affected if The installed build number is lower than the affected threshold for your Windows release (17763.8880, 19044.7417, 19045.7417, 22631.7219, 26100.8655, 26200.8655, 28000.2269)
  2. Confirm Windows Push Notifications component is present
    Check for the presence of the Windows Push Notification service by running 'Get-Service -Name WpnUserService' in PowerShell or checking registry key 'HKLM\SYSTEM\CurrentControlSet\Services\WpnUserService'
    Affected if The Windows Push Notification User Service (WpnUserService) exists on the system
  3. Verify local attacker execution context
    The vulnerability requires a locally authenticated attacker to manipulate shared resources; assess whether untrusted local users have the ability to execute code on the system
    Affected if Multiple users have local account access or the system permits execution by non-privileged accounts

If your Windows build is below the affected threshold and the Push Notifications service is present, your environment may be vulnerable to this privilege escalation flaw.

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 10.0.17763.8880 / 10.0.19044.7417 / 10.0.19045.7417 or later
Fixed in 10.0.17763.888010.0.19044.741710.0.19045.7417
Interim mitigation

Apply Microsoft security updates for Windows Push Notifications when available. Restrict local user privileges and monitor for unusual notification service behavior. Consider disabling push notifications if not required in high-security environments.

Recommended fix High confidence

Apply Microsoft security update for CVE-2026-42979 from Windows Update or Microsoft Update Catalog (specific KB number available on MSRC)

  1. Check current Windows version and build number by running 'winver' or 'systeminfo | findstr /B /C:"OS Name" /C:"OS Version"'
  2. Open Windows Update by typing 'ms-settings:windowsupdate' in Windows Run dialog
  3. Click 'Check for updates' and install all available security updates
  4. After updates install, restart the system when prompted
  5. Verify the installed build number matches or exceeds the fixed version for your Windows release (Windows 10 1809/Server 2019: 10.0.17763.8880, 21H2: 10.0.19044.7417, 22H2: 10.0.19045.7417, 11 23H2: 10.0.22631.7219, 11 24H2: 10.0.26100.8655, 11 25H2: 10.0.26200.8655, 11 26H1: 10.0.28000.2269)
Caveat Standard Windows security update; no expected breaking changes for most users

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

Fix this in Windows 10 1809 Scoped from the published advisory
  • Consultation4.0 h
  • Implementation8.0 h
  • Testing6.0 h
  • Review / QA4.0 h
22.0 hours of engineering $3,860
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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-2026-42979 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