CVE-2026-66804
Microsoft Windows Cross Device Service Elevation of Privilege Vulnerability
Improper access control in Windows Cross Device Service allows an authorized attacker to elevate privileges locally.
Attack profile
How easy it is to exploit
- Attack vector
- Local
- Complexity
- Low
- Privileges needed
- Low
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
What each source reports
CVE List Score used
Microsoft Windows Cross Device Service Elevation of Privilege Vulnerability
Improper access control in Windows Cross Device Service allows an authorized attacker to elevate privileges locally.
- Record
CVE-2026-66804- CVSS 3.1
- 7.8 High
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C - Weakness
- CWE-284
- Updated
- 2026-11-10
EUVDEUVD-2026-56595
Improper access control in Windows Cross Device Service allows an authorized attacker to elevate privileges locally.
- Record
EUVD-2026-56595- CVSS 3.1
- 7.8 High
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C - Updated
- 2026-11-10
GitHub AdvisoriesGHSA-m9fr-m5pc-g6ww
Improper access control in Windows Cross Device Service allows an authorized attacker to elevate...
Improper access control in Windows Cross Device Service allows an authorized attacker to elevate privileges locally.
- Record
GHSA-m9fr-m5pc-g6ww- CVSS 3.1
- 7.8 High
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-284
- Updated
- 2026-11-02
NVD
Improper access control in Windows Cross Device Service allows an authorized attacker to elevate privileges locally.
- Record
CVE-2026-66804- CVSS 3.1
- 7.8 High
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-284
- Updated
- 2026-11-02
Affected products
Public exploits
Links only. Every CVE stores no exploit code.
| Source | Link | Date |
|---|---|---|
| PoC in GitHub | DavidCarliez/CVE-2026-66804-CrossDevice-LPE | 2026-07-23 |
| PoC in GitHub | CypherHippie/CVE-2026-66804 | 2026-07-25 |
| PoC in GitHub | Rat5ak/CVE-2026-66804-CrossDevice-Service-EoP | 2026-08-13 |
History
| Recorded | Changed | Sources |
|---|---|---|
| exploits, facts | PoC in GitHub | |
| first indexed | CVE List, EUVD, GitHub Advisories, NVD, PoC in GitHub |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-66804 is a high vulnerability (CVSS 7.8) in Microsoft Windows 10 Version 22h2, published August 11, 2026. Public exploit code exists. EPSS puts the chance of exploitation in the next 30 days at 0.30%, the 22nd percentile. No source names a fixed version.