CVE-2026-50317
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 · uneditedConcurrent execution using shared resource with improper synchronization ('race condition') in Windows Operating Systems allows an authorized attacker to elevate privileges locally.
In the news
Third-party coverage- Microsoft July 2026 Patch Tuesday fixes massive 570 flaws, 3 zero-days
- Microsoft CVE Summary - Bleeping Computer
Surfaced from public web coverage — external links open in a new tab.
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 confidenceThis is a race condition vulnerability in Windows Operating Systems where improper synchronization of shared resources allows an authorized local attacker to elevate privileges. The vulnerability stems from concurrent execution issues that can be exploited to gain higher-level access than the attacker initially possesses.
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< 10.0.26100.8875< 10.0.26200.8875< 10.0.28000.2269< 10.0.28000.2525< 10.0.26100.33158CVSS 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
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:L/AC:H/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 build versionRun 'winver' or 'systeminfo | findstr /B /C:"OS Version"' or 'ver' command to obtain the exact build numberAffected if The build number is below 10.0.26100.8875 for 24h2, below 10.0.26200.8875 for 25h2, below 10.0.28000.2269 or 10.0.28000.2525 for 26h1, or below 10.0.26100.33158 for Windows Server 2025
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Confirm Windows edition and buildRun 'Get-ComputerInfo | Select-Object WindowsProductName, WindowsVersion, OsHardwareAbstractionLayerVersion' in PowerShell to get detailed version infoAffected if The detected build falls within the vulnerable version ranges listed for any affected product
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Verify installed security updatesRun 'Get-HotFix | Where-Object {$_.InstalledOn -gt [DateTime]::Now.AddDays(-60)} | Sort-Object InstalledOn -Descending' to list recent security patches, or check Windows Update history manuallyAffected if No recent Windows security updates are installed, or the specific patch for this CVE is absent
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Check for signs of privilege escalation activityReview Security event logs (Event Viewer > Windows Logs > Security) for Event ID 4672 (Special privileges assigned) or 4688 (Process creation) for suspicious new accounts or processes, especially from low-privilege user contextsAffected if Unusual privilege assignments or processes running under elevated context appear without corresponding administrative action
You are affected if your Windows version matches any of the affected builds and the corresponding security update for CVE-2026-50317 has not been applied.
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 · scoped10.0.26100.887510.0.26100.3315810.0.26200.8875
Apply Microsoft security updates for Windows OS once available. Conduct privilege audit and monitor for suspicious local privilege escalation attempts in the interim.
Apply the appropriate Windows security update that addresses CVE-2026-50317; fixed builds are 10.0.26100.8875 (24h2), 10.0.26200.8875 (25h2), 10.0.28000.2269/2525 (26h1), or 10.0.26100.33158 (Server 2025)
- Check the current Windows build version by running 'winver' or 'systeminfo' in the command prompt
- Open Windows Settings > Windows Update > Check for updates
- Install all available security updates, ensuring the update includes the fix for CVE-2026-50317
- Alternatively, manually download the appropriate KB patch from the Microsoft Update Catalog for your specific Windows version
- Restart the system after applying the update
- Verify the installed build version matches or exceeds the fixed version (10.0.26100.8875 for 24h2, 10.0.26200.8875 for 25h2, 10.0.28000.2269/2525 for 26h1, or 10.0.26100.33158 for Server 2025)
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation4.0 h
- Implementation8.0 h
- Testing6.0 h
- Review / QA4.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $6,176.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-50317 — 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-2026-50317 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
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