CVE-2026-66804: CWE-284: Improper Access Control in Microsoft Windows 10 Version 22H2
Improper access control in Windows Cross Device Service allows an authorized attacker to elevate privileges locally.
AI Analysis
Technical Summary
This vulnerability (CVE-2026-66804) is classified as CWE-284: Improper Access Control. It affects Windows 10 Version 22H2 (specifically version 10.0.19045.0). The flaw exists in the Windows Cross Device Service and enables an authorized local attacker to elevate their privileges. The CVSS v3.1 base score is 7.8, indicating high severity, with attack vector local, low attack complexity, and no user interaction required. Microsoft has published an official fix for this vulnerability.
Potential Impact
Exploitation of this vulnerability allows an authorized local attacker to gain elevated privileges, potentially leading to full system compromise. The confidentiality, integrity, and availability impacts are all rated high according to the CVSS vector. There are no known exploits in the wild at this time.
Mitigation Recommendations
An official fix is available from Microsoft. Users and administrators should apply the security update provided by Microsoft for Windows 10 Version 22H2 (10.0.19045.0) as detailed in the Microsoft Security Response Center advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-66804.
CVE-2026-66804: CWE-284: Improper Access Control in Microsoft Windows 10 Version 22H2
Description
Improper access control in Windows Cross Device Service allows an authorized attacker to elevate privileges locally.
CVSS v3.1
Score 7.8high
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-66804) is classified as CWE-284: Improper Access Control. It affects Windows 10 Version 22H2 (specifically version 10.0.19045.0). The flaw exists in the Windows Cross Device Service and enables an authorized local attacker to elevate their privileges. The CVSS v3.1 base score is 7.8, indicating high severity, with attack vector local, low attack complexity, and no user interaction required. Microsoft has published an official fix for this vulnerability.
Potential Impact
Exploitation of this vulnerability allows an authorized local attacker to gain elevated privileges, potentially leading to full system compromise. The confidentiality, integrity, and availability impacts are all rated high according to the CVSS vector. There are no known exploits in the wild at this time.
Mitigation Recommendations
An official fix is available from Microsoft. Users and administrators should apply the security update provided by Microsoft for Windows 10 Version 22H2 (10.0.19045.0) as detailed in the Microsoft Security Response Center advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-66804.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-07-27T19:02:26.601Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-66804","vendor":"Microsoft"}]
Threat ID: 6a7b5835bf8831d539156505
Added to database: 08/11/2026, 17:13:25 UTC
Last enriched: 08/11/2026, 18:46:49 UTC
Last updated: 08/12/2026, 00:12:10 UTC
Views: 3
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