Windows Cloud Files Mini Filter Driver Tampering Vulnerability
33Vexday Risk Score
No sign of exploitation. It has a public proof of concept.
ssvc Attendcvss 5.5epss 0.3%
from disclosure to weapon1 days
Published on NVDSep 8
1st PoC+1d
exploitation probability
0.3%top 72% of all CVEs
observed exploitation
nono source reports it
2 public exploit(s)
Missing authentication for critical function in Windows Cloud Files Mini Filter Driver allows an authorized attacker to perform tampering locally.
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N/E:U/RL:O/RC:C
Affected products
Microsoft · Windows 10 Version 1809Microsoft · Windows 10 Version 21H2Microsoft · Windows 10 Version 22H2Microsoft · Windows 11 version 23H2Microsoft · Windows 11 Version 24H2Microsoft · Windows 11 Version 25H2Microsoft · Windows 11 version 26H1Microsoft · Windows Server 2019Microsoft · Windows Server 2019 (Server Core installation)Microsoft · Windows Server 2022Microsoft · Windows Server 2025Microsoft · Windows Server 2025 (Server Core installation)public PoCs found — 2
githubgithub.com/karollooool/CVE-2026-83991-writeup-and-poc★ 15githubgithub.com/ZeroDayVPN/CVE-2026-83991-WriteUP-and-PoC★ 0⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.