# CVE-2026-69279: Microsoft Windows Cloud Files Mini Filter Driver use-after-free privilege escalation

Source: https://junglewise.ai/threats/cve-2026-69279-microsoft-windows-cloud-files-mini-filter-driver-use-after-free  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-08. Updated: 2026-09-26  
License: CC BY 4.0 with a link back

CVE-2026-69279 · Severity: high · CVSS 7 · Published 2026-09-08

The Windows Cloud Files Mini Filter Driver is a system component that manages file synchronization in Windows. A use-after-free vulnerability allows an authorized local user to execute arbitrary code with elevated privileges, potentially compromising system security and enabling full system takeover.

Technologies: [Microsoft Windows Cloud Files Mini Filter Driver](https://junglewise.ai/threats/technologies/windows-cloud-files-mini-filter-driver). Vendors: [Microsoft](https://junglewise.ai/threats/vendors/microsoft).

## Quick answers

**Is CVE-2026-69279 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-69279 being exploited in the wild.

**How severe is CVE-2026-69279?** High severity, with a CVSS score of 7, published 8 September 2026.

**Which products and versions are affected?** Microsoft Windows Cloud Files Mini Filter Driver <UNKNOWN>.

**Is there a fix for CVE-2026-69279?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-69279 attacked?** It is attacked with local access.

**Am I affected by CVE-2026-69279?** Check whether you run Microsoft Windows Cloud Files Mini Filter Driver at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

A use-after-free vulnerability exists in the Windows Cloud Files Mini Filter Driver, a kernel-mode driver responsible for cloud file synchronization. The vulnerability allows an authorized local attacker to trigger memory access after the memory has been freed, leading to code execution at the kernel level. This requires local code execution capability but does not require administrative privileges. An attacker with valid user credentials can exploit this flaw to escalate to SYSTEM privileges, potentially compromising the entire operating system.

## Affected products

- Microsoft Windows Cloud Files Mini Filter Driver <UNKNOWN>

## Timeline

- 2026-09-08: disclosed
- 2026-09-08: advisory

## References

- [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69279](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69279)

## Related threats

- [Windows Cloud Files Mini Filter Driver improper access control](https://junglewise.ai/threats/cve-2026-112803-improper-access-control-in-windows-cloud-files-mini-filter)
- [Microsoft Windows Cloud Files Mini Filter Driver authentication bypass](https://junglewise.ai/threats/cve-2026-83991-microsoft-windows-cloud-files-mini-filter-driver-authentication)
- [Microsoft Windows Cloud Files Mini Filter Driver type confusion](https://junglewise.ai/threats/cve-2026-80093-microsoft-windows-cloud-files-mini-filter-driver-type-confusion)