CVE-2026-83991
Windows Cloud Files Mini Filter Driver Tampering vulnerability
MSRC advisory September 8, 2026
Alert details
- Source feed
- Microsoft MSRC
- CVE ID
- CVE-2026-83991
- Affected products
- Windows Cloud Files Mini Filter Driver Tampering · Microsoft Windows Cloud Files Mini Filter Driver Tampering · Microsoft
What happened
<p>Missing authentication for critical function in Windows Cloud Files Mini Filter Driver allows an authorized attacker to perform tampering locally.</p>
What it means for your business
Windows Cloud Files Mini Filter Driver Tampering vulnerability (CVE-2026-83991) was added to Microsoft’s security update guidance. <p>Missing authentication for critical function in Windows Cloud Files Mini Filter Driver allows an authorized attacker to perform tampering locally.</p> If you need help checking exposure, call (864) 335-9223.
Sources
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