SYSTEM escalation via missing-path DLL planting
Published Aug 11, 2026 · Updated Aug 25, 2026
Improper access control in Windows Cross Device Service in Windows 10 22H2 and Windows 11 24H2 through 26H1 lets local users gain SYSTEM. A machine-wide COM registration points the Cross Device virtual-camera server to %PROGRAMDATA%\CrossDevice\CrossDevice.Streaming.Source.dll, but vulnerable systems can expose that path before the directory exists, letting a low-privileged user create it and plant a malicious DLL that Windows Camera Frame Server loads as LOCAL SERVICE. Exploitation requires local code execution and the missing-path state; the published proof chain then uses the service token's SeImpersonatePrivilege to escalate from a standard account to SYSTEM.
Summary
What happened
Improper access control in Windows Cross Device Service in Windows 10 22H2 and Windows 11 24H2 through 26H1 lets local users gain SYSTEM. A machine-wide COM registration points the Cross Device virtual-camera server to %PROGRAMDATA%\CrossDevice\CrossDevice.Streaming.Source.dll, but vulnerable systems can expose that path before the directory exists, letting a low-privileged user create it and plant a malicious DLL that Windows Camera Frame Server loads as LOCAL SERVICE. Exploitation requires local code execution and the missing-path state; the published proof chain then uses the service token's SeImpersonatePrivilege to escalate from a standard account to SYSTEM.
The record
- CVE
- CVE-2026-66804
- Published
- Aug 11, 2026
- Updated
- Aug 25, 2026
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-284, T1546.015
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Aug 11, 2026CVE publishedPublication date reported by the CVE source.
- Aug 25, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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What conditions does exploitation require?
What is affected?
Affected products and versions are unavailable in this record.
Published CVSS scores
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.
Public exploit references
- CVE-2026-66804 Windows Cross Device virtual camera EoPproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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