Is CVE-2026-80093 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-80093 being exploited in the wild.

How severe is CVE-2026-80093?

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 10.0.26100.8457, 10.0.26100.8655.

Is there a fix for CVE-2026-80093?

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-2026-80093 attacked?

It is attacked with local access.

Am I affected by CVE-2026-80093?

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.

CVE-2026-80093: Microsoft Windows Cloud Files Mini Filter Driver type confusion

CVE-2026-80093 · Severity: high · CVSS 7 · Published 2026-09-08

Windows Cloud Files Mini Filter Driver is a kernel component that enables cloud storage features like OneDrive Files On-Demand. A type confusion vulnerability allows a local authenticated attacker to achieve privilege escalation and potentially cause system crashes through malformed Cloud Filter API calls. This could lead to unauthorized access to sensitive files or system instability.

Technologies: Microsoft Windows Cloud Files Mini Filter Driver. Vendors: Microsoft.

Quick answers

Is CVE-2026-80093 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-80093 being exploited in the wild.
How severe is CVE-2026-80093?: 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 10.0.26100.8457, 10.0.26100.8655.
Is there a fix for CVE-2026-80093?: 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-2026-80093 attacked?: It is attacked with local access.
Am I affected by CVE-2026-80093?: 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

The vulnerability is a type confusion flaw (CWE-843) in the CldiStreamPrepareRequestForMoreProcessing function of the Cloud Files Mini Filter Driver (cldflt.sys). The root cause involves a race condition where one thread walks an OpenStream request list while another thread inserts a stack-based sentinel, causing the abort walker to misinterpret the sentinel as a CLD_STREAM_REQUEST_PARTIAL object at offset +0x8. This results in the creation of a fake request object backed by kernel stack memory, which can be dereferenced and written through a forged pointer. An authenticated local attacker can trigger this by registering a provider, creating a dehydrated placeholder, initiating a read operation that creates a pending request, and then calling the CfAbortOperation API with wildcard values. Successful exploitation can lead to kernel arbitrary write primitives, privilege escalation, or denial of service; patches from Microsoft are available.

Affected products

Microsoft Windows Cloud Files Mini Filter Driver 10.0.26100.8457, 10.0.26100.8655

Timeline

2026-09-08: disclosed
2026-09-26: other: Talos vulnerability report TALOS-2026-2445 published

References

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