CVE-2026-70270: Windows Container Isolation FS Filter Driver Elevation of Privilege Vulnerability
This Microsoft advisory covers CVE-2026-70270 in Windows Server 2019, Windows Server 2022 and Windows Server 2025.
- CVE-2026-70270
Key facts
- Vendor rating
- Medium, CVSS 5.5
- CISA KEV
- Not listed (catalogue checked )
- Affected
- Windows 10 Version 1607 10.0.14393.0 before 10.0.14393.9612; Windows 10 Version 1809 10.0.17763.0 before 10.0.17763.9376; Windows 10 Version 21H2 10.0.19044.0 before 10.0.19044.7807 and 9 more below
- Fixed in
- KB5126651 (build 10.0.17763.9376), KB5126655 (build 10.0.20348.5761), KB5126657 (build 10.0.19045.7807) and 5 more below
- Source published
- Listed by VulniPulse
Compiled by VulniPulse from the linked sources. How records are collected and checked.
Affected products & platforms
Description
Windows Container Isolation FS Filter Driver Elevation of Privilege Vulnerability
Affected products named by the advisory: Windows Server 2019; Windows Server 2022; Windows Server 2025; Windows Server 2016.
Text from the source record.
- Windows 10 Version 1607 10.0.14393.0 before 10.0.14393.9612
- Windows 10 Version 1809 10.0.17763.0 before 10.0.17763.9376
- Windows 10 Version 21H2 10.0.19044.0 before 10.0.19044.7807
- Windows 10 Version 22H2 10.0.19045.0 before 10.0.19044.7807
- Windows 11 version 23H2 10.0.22631.0 before 10.0.22631.7652
- Windows 11 Version 23H2 10.0.22631.0 before 10.0.22631.7652
- Windows 11 Version 24H2 10.0.26100.0 before 10.0.26100.9711
- Windows 11 Version 25H2 10.0.26200.0 before 10.0.26200.9711
- Windows 11 version 26H1 10.0.28000.0 before 10.0.28000.3231
- Windows 11 Version 26H2 10.0.26300.0 before 10.0.26300.9711
- Windows Server 2016 10.0.14393.0 before 10.0.14393.9612
- Windows Server 2016 (Server Core installation) 10.0.14393.0 before 10.0.14393.9612
Official advisory · high-confidence parse· fetched ·verify at source
How to fix CVE-2026-70270
Upgrade to a fixed release named by Microsoft:
- KB5126651 (build 10.0.17763.9376)
- KB5126655 (build 10.0.20348.5761)
- KB5126657 (build 10.0.19045.7807)
- KB5126646 (build 10.0.26100.33650)
- KB5127648 (build 10.0.26300.9711)
- KB5126653 (build 10.0.22631.7652)
- KB5127646 (build 10.0.28000.3231)
- KB5126868 (build 10.0.14393.9612)
Vendor guidance
- Install the applicable security update for your platform: KB5126651, KB5126655, KB5126657, KB5126646, KB5127648, KB5126653 (see the Microsoft Update Catalog).
End-of-life dates for Windows Server
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