CVE-2026-80093Public exploit

Privilege escalation via fake request object write

Published Sep 8, 2026 · Updated Sep 10, 2026

Type confusion in Microsoft's Windows Cloud Files Mini Filter Driver allows local users to elevate privileges via crafted Cloud Filter API calls. CldStreamAbortOperation treats a stack sentinel in OpenStream->RequestListHead as a request object, and CldiStreamPrepareRequestForMoreProcessing writes through its fake QueueContext pointer. A low-privileged local process must register a sync provider, create and read a dehydrated placeholder, and win a race between abort and disconnect calls; success corrupts kernel memory, while failed attempts can crash the host.

CVSS severity8.8
High
EPSS probability0.34%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Type confusion in Microsoft's Windows Cloud Files Mini Filter Driver allows local users to elevate privileges via crafted Cloud Filter API calls. CldStreamAbortOperation treats a stack sentinel in OpenStream->RequestListHead as a request object, and CldiStreamPrepareRequestForMoreProcessing writes through its fake QueueContext pointer. A low-privileged local process must register a sync provider, create and read a dehydrated placeholder, and win a race between abort and disconnect calls; success corrupts kernel memory, while failed attempts can crash the host.

The record

CVE
CVE-2026-80093
Published
Sep 8, 2026
Updated
Sep 10, 2026
Vendor
Microsoft
Product
Windows Server 2019
Classifications
CWE-416, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 8, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 10, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=10.0.17763.0 <10.0.17763.9245

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Microsoft · Windows Server 2019version=10.0.17763.0 <10.0.17763.9245
Microsoft · Windows Server 2025 (Server Core installation)version=10.0.26100.0 <10.0.26100.33438
Microsoft · Windows 11, version 25H2version=10.0.26200.0 <10.0.26200.9445
Microsoft · Windows 11, version 24H2version=10.0.26100.0 <10.0.26100.9445
Microsoft · Windows 10 Version 21H2version=10.0.19044.0 <10.0.19044.7725
Microsoft · Windows 10 Version 22H2version=10.0.19045.0 <10.0.19045.7725
Microsoft · Windows Server 2019 (Server Core installation)version=10.0.17763.0 <10.0.17763.9245
Microsoft · Windows 11, version 26H1version=10.0.28000.0 <10.0.28000.2954
Microsoft · Windows 11 Version 23H2version=10.0.22631.0 <10.0.22631.7582
Microsoft · Windows Server 2022version=10.0.20348.0 <10.0.20348.5622
Microsoft · Windows Server 2025version=10.0.26100.0 <10.0.26100.33438
Microsoft · Windows 10 Version 1809version=10.0.17763.0 <10.0.17763.9245

Published CVSS scores

8.8Cisco TalosCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-416Use After Free
T1068Exploitation for Privilege Escalation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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