{"id":"CVE-2026-66804","aliases":["EUVD-2026-56595","GHSA-m9fr-m5pc-g6ww"],"status":"published","title":"Microsoft Windows Cross Device Service Elevation of Privilege Vulnerability","description":"Improper access control in Windows Cross Device Service allows an authorized attacker to elevate privileges locally.","severity":{"version":"3.1","score":7.8,"vector":"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","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.00298,"percentile":0.22669,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":true,"fix_available":false},"cwes":["CWE-284"],"published":"2026-08-11T17:05:36Z","modified":"2026-10-21T20:53:06Z","exploits":[{"source":"pocgithub","id":"DavidCarliez/CVE-2026-66804-CrossDevice-LPE","title":"DavidCarliez/CVE-2026-66804-CrossDevice-LPE","date":"2026-07-23","url":"https://github.com/DavidCarliez/CVE-2026-66804-CrossDevice-LPE"},{"source":"pocgithub","id":"CypherHippie/CVE-2026-66804","title":"CypherHippie/CVE-2026-66804","date":"2026-07-25","url":"https://github.com/CypherHippie/CVE-2026-66804"},{"source":"pocgithub","id":"Rat5ak/CVE-2026-66804-CrossDevice-Service-EoP","title":"Rat5ak/CVE-2026-66804-CrossDevice-Service-EoP","date":"2026-08-13","url":"https://github.com/Rat5ak/CVE-2026-66804-CrossDevice-Service-EoP"}],"products":[{"vendor":"microsoft","product":"windows 10 version 22h2"},{"vendor":"microsoft","product":"windows 11 version 24h2"},{"vendor":"microsoft","product":"windows 11 version 25h2"},{"vendor":"microsoft","product":"windows 11 version 26h1"},{"vendor":"microsoft","product":"windows_10_22h2"},{"vendor":"microsoft","product":"windows_11_24h2"},{"vendor":"microsoft","product":"windows_11_25h2"},{"vendor":"microsoft","product":"windows_11_26h1"}],"references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-66804","tags":["vendor-advisory","patch","Vendor Advisory","Patch"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-66804"},{"url":"https://github.com/advisories/GHSA-m9fr-m5pc-g6ww"}],"sources":{"cve":[{"id":"CVE-2026-66804","title":"Microsoft Windows Cross Device Service Elevation of Privilege Vulnerability","description":"Improper access control in Windows Cross Device Service allows an authorized attacker to elevate privileges locally.","status":"published","published":"2026-08-11T17:05:36.051Z","modified":"2026-11-10T21:59:18.044Z","cvss":[{"version":"3.1","score":7.8,"vector":"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","level":"high","assessor":"cna"}],"cwes":["CWE-284"],"updated_at":"2026-11-10T22:48:52.144232Z"}],"euvd":[{"id":"EUVD-2026-56595","description":"Improper access control in Windows Cross Device Service allows an authorized attacker to elevate privileges locally.","status":"published","published":"2026-08-11T17:05:36Z","modified":"2026-11-10T21:59:18Z","cvss":[{"version":"3.1","score":7.8,"vector":"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","level":"high"}],"updated_at":"2026-11-10T23:24:17.329747Z"}],"ghsa":[{"id":"GHSA-m9fr-m5pc-g6ww","title":"Improper access control in Windows Cross Device Service allows an authorized attacker to elevate...","description":"Improper access control in Windows Cross Device Service allows an authorized attacker to elevate privileges locally.","status":"published","published":"2026-08-11T18:31:41Z","modified":"2026-08-11T18:31:49Z","cvss":[{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"cwes":["CWE-284"],"updated_at":"2026-11-02T15:10:20.59674Z"}],"nvd":[{"id":"CVE-2026-66804","description":"Improper access control in Windows Cross Device Service allows an authorized attacker to elevate privileges locally.","status":"published","published":"2026-08-11T17:19:01.733Z","modified":"2026-08-14T18:06:11.42Z","cvss":[{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"secondary"}],"cwes":["CWE-284"],"updated_at":"2026-11-02T14:12:36.880938Z"}]}}