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Description

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

PUBLISHED Reserved 2025-12-03 | Published 2026-01-13 | Updated 2026-02-22 | Assigner microsoft




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

Problem types

CWE-822: Untrusted Pointer Dereference

Product status

10.0.17763.0 (custom) before 10.0.17763.8276
affected

10.0.19044.0 (custom) before 10.0.19044.6809
affected

10.0.19045.0 (custom) before 10.0.19045.6809
affected

10.0.22631.0 (custom) before 10.0.22631.6491
affected

10.0.22631.0 (custom) before 10.0.22631.6491
affected

10.0.26100.0 (custom) before 10.0.26100.7623
affected

10.0.26200.0 (custom) before 10.0.26200.7623
affected

10.0.17763.0 (custom) before 10.0.17763.8276
affected

10.0.17763.0 (custom) before 10.0.17763.8276
affected

10.0.20348.0 (custom) before 10.0.20348.4648
affected

10.0.25398.0 (custom) before 10.0.25398.2092
affected

10.0.26100.0 (custom) before 10.0.26100.32230
affected

10.0.26100.0 (custom) before 10.0.26100.32230
affected

References

msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20857 (Windows Cloud Files Mini Filter Driver Elevation of Privilege Vulnerability) vendor-advisory patch

cve.org (CVE-2026-20857)

nvd.nist.gov (CVE-2026-20857)

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