VDB

CVE-2026-20857

CVE-2026-20857 PUBLISHED CVSS 7.8 HIGH

Windows Cloud Files Mini Filter Driver Elevation of Privilege Vulnerability

Reported by microsoft · Published January 13, 2026

Untrusted pointer dereference in Windows Cloud Files Mini Filter Driver allows an authorized attacker to elevate privileges locally.

Fixed versions

Upgrade to a fixed version or later. Language registries are listed first, then Linux distributions, then vendor products.

PackageEcosystemFixed in
windows_10_1809microsoft10.0.17763.8276
Windows 11 Version 24H2Microsoft10.0.26100.7623

Risk scores

CVSS 3.1
7.8
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C

Affected products

VendorProductVersions
MicrosoftWindows 10 Version 180910.0.17763.0
MicrosoftWindows 10 Version 21H210.0.19044.0
MicrosoftWindows 10 Version 22H210.0.19045.0
MicrosoftWindows 11 version 23H210.0.22631.0
MicrosoftWindows 11 Version 23H210.0.22631.0
MicrosoftWindows 11 Version 24H210.0.26100.0
MicrosoftWindows 11 Version 25H210.0.26200.0
MicrosoftWindows Server 201910.0.17763.0
MicrosoftWindows Server 2019 (Server Core installation)10.0.17763.0
MicrosoftWindows Server 202210.0.20348.0
MicrosoftWindows Server 2022, 23H2 Edition (Server Core installation)10.0.25398.0
MicrosoftWindows Server 202510.0.26100.0
MicrosoftWindows Server 2025 (Server Core installation)10.0.26100.0
microsoftwindows_11_24H210.0.26100.0
MicrosoftWindows 11 Version 23H210.0.22631.0
microsoftwindows_server_202510.0.26100.0
microsoftwindows_10_21H210.0.19044.0
microsoftwindows_10_180910.0.17763.0
MicrosoftWindows Server 201910.0.17763.0
microsoftwindows_11_23H210.0.22631.0

…and 16 more

Timeline

  • Jan 13, 2026 CVE Published
  • Jan 13, 2026 PoC Published (3 in total, the first dated here)
  • Jan 14, 2026 EPSS Score (30 in total, the first dated here)
  • Mar 3, 2026 Security Advisory (6 in total, the first dated here)
  • Mar 25, 2026 Coalition ESS Score (2 in total, the first dated here)
  • Jul 30, 2026 CVE Updated

Query this with the API

The same record, from the CLI:

vulnetix vdb vuln CVE-2026-20857
vulnetix vdb fixes CVE-2026-20857

Or with curl, using the org id and key from your account page:

curl -s -H "Authorization: ApiKey ${VULNETIX_ORG_ID}:${VULNETIX_API_KEY}" \
  "https://api.vdb.vulnetix.com/v2/vuln/CVE-2026-20857/fixes/registry"

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References

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