Windows Fast FAT File System Driver Information Disclosure Vulnerability
CVE-2026-70277
Summary
Uncaught exception in Windows Server Update Service allows an unauthorized attacker to perform tampering over a network.
Products covered
Windows 10 Version 1809 for 32-bit Systems
Windows 10 Version 1809 for x64-based Systems
Windows Server 2019
Windows Server 2019 (Server Core installation)
Windows Server 2022
Windows Server 2025 (Server Core installation)
Windows Server 2025
Windows 10 Version 1607 for 32-bit Systems
Show 7 more products
Windows 10 Version 1607 for x64-based Systems
Windows Server 2016
Windows Server 2016 (Server Core installation)
Windows Server 2012
Windows Server 2012 (Server Core installation)
Windows Server 2012 R2
Windows Server 2012 R2 (Server Core installation)
Remediation
Install KB5099538. Install KB5099540. Install KB5099536. Install KB5099535. Install KB5099445. Install KB5099444.
Vendor-listed fixes
10.0.17763.9020
10.0.20348.5386
10.0.26100.33158
10.0.14393.9339
6.2.9200.26226
6.3.9600.23291
CVEs in this advisory 1
Updates
- Published by Microsoft Security Response Center
The publication date reported by the vendor.
- Added to SecurityAlert
We collected the advisory from the official source.
- Confirmed at the source
Our collector saw this advisory during a later source check.