{"id":"CVE-2026-83566","aliases":["EUVD-2026-99916","GHSA-gm8q-ggp2-97xw"],"status":"published","title":"Windows Win32k Elevation of Privilege Vulnerability","description":"Use after free in Windows Win32K - ICOMP allows an authorized attacker to elevate privileges locally.","severity":{"version":"3.1","score":7,"vector":"CVSS:3.1/AV:L/AC:H/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":"2026-11-11","score":0.003,"percentile":0.22943,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-416"],"published":"2026-10-13T19:00:48Z","modified":"2026-11-10T20:41:51Z","products":[{"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 11 version 26h2"},{"vendor":"microsoft","product":"windows server 2025"},{"vendor":"microsoft","product":"windows server 2025 (server core installation)"},{"vendor":"microsoft","product":"windows_11_24h2"},{"vendor":"microsoft","product":"windows_11_25h2"},{"vendor":"microsoft","product":"windows_11_26h1"},{"vendor":"microsoft","product":"windows_11_26h2"},{"vendor":"microsoft","product":"windows_server_2025"}],"references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83566","tags":["vendor-advisory","patch","Patch","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-83566"},{"url":"https://github.com/advisories/GHSA-gm8q-ggp2-97xw"}],"sources":{"cve":[{"id":"CVE-2026-83566","title":"Windows Win32k Elevation of Privilege Vulnerability","description":"Use after free in Windows Win32K - ICOMP allows an authorized attacker to elevate privileges locally.","status":"published","published":"2026-10-13T19:00:48.033Z","modified":"2026-11-10T20:41:51.978Z","cvss":[{"version":"3.1","score":7,"vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C","level":"high","assessor":"cna"}],"cwes":["CWE-416"],"updated_at":"2026-11-10T22:18:28.707469Z"}],"euvd":[{"id":"EUVD-2026-99916","description":"Use after free in Windows Win32K - ICOMP allows an authorized attacker to elevate privileges locally.","status":"published","published":"2026-10-13T19:00:48Z","modified":"2026-11-10T20:41:51Z","cvss":[{"version":"3.1","score":7,"vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C","level":"high"}],"updated_at":"2026-11-10T22:23:58.135191Z"}],"ghsa":[{"id":"GHSA-gm8q-ggp2-97xw","title":"Use after free in Windows Win32K - ICOMP allows an authorized attacker to elevate privileges...","description":"Use after free in Windows Win32K - ICOMP allows an authorized attacker to elevate privileges locally.","status":"published","published":"2026-10-13T21:34:27Z","modified":"2026-10-13T21:34:29Z","cvss":[{"version":"3.1","score":7,"vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"cwes":["CWE-416"],"updated_at":"2026-11-02T15:13:16.244853Z"}],"nvd":[{"id":"CVE-2026-83566","description":"Use after free in Windows Win32K - ICOMP allows an authorized attacker to elevate privileges locally.","status":"published","published":"2026-10-13T19:19:58.93Z","modified":"2026-10-28T19:27:56.387Z","cvss":[{"version":"3.1","score":7,"vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"secondary"}],"cwes":["CWE-416"],"updated_at":"2026-11-02T14:12:57.603498Z"}]}}