CVE-2026-66804

Improper access control in Windows Cross Device Service allows an authorized attacker to elevate privileges locally.

CVSS v3.1

7.8 HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS

5.31% chance of exploitation in the next 30 days, 92th percentile

Published

2026-08-11

Updated

2026-08-31

Proof-of-concept exploits (3)

• DavidCarliez/CVE-2026-66804-CrossDevice-LPE12★ · 2026-08-11
• CypherHippie/CVE-2026-668041★ · 2026-08-18
• Rat5ak/CVE-2026-66804-CrossDevice-Service-EoP24★ · 2026-08-13

References

• CVE Record
• NVD entry

Related

• CVE-2019-9702
• CVE-2026-49176
• CVE-2026-50454
• CVE-2026-54992
• CVE-2026-58635
• CVE-2026-34486