{"id":"CVE-2026-20870","aliases":["EUVD-2026-2179","GHSA-5m23-p78p-xgrg"],"status":"published","title":"Windows Win32 Kernel Subsystem 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":7.8,"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":0.00467,"percentile":0.40742,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-416"],"published":"2026-01-13T17:56:59Z","modified":"2026-07-30T21:17:06Z","products":[{"vendor":"microsoft","product":"windows 11 version 24h2"},{"vendor":"microsoft","product":"windows 11 version 25h2"},{"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_server_2025"}],"references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20870","tags":["vendor-advisory","patch","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-20870"},{"url":"https://github.com/advisories/GHSA-5m23-p78p-xgrg"}],"sources":{"cve":[{"id":"CVE-2026-20870","title":"Windows Win32 Kernel Subsystem Elevation of Privilege Vulnerability","description":"Use after free in Windows Win32K - ICOMP allows an authorized attacker to elevate privileges locally.","status":"published","published":"2026-01-13T17:56:59.544Z","modified":"2026-07-30T20:47:19.384Z","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-416"],"updated_at":"2026-11-02T13:35:44.571002Z"}],"euvd":[{"id":"EUVD-2026-2179","description":"Use after free in Windows Win32K - ICOMP allows an authorized attacker to elevate privileges locally.","status":"published","published":"2026-01-13T17:56:59Z","modified":"2026-07-30T20:47:19Z","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":"2026-11-02T18:02:27.233735Z"}],"ghsa":[{"id":"GHSA-5m23-p78p-xgrg","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":"2026-01-13T18:31:09Z","modified":"2026-01-13T18:31:18Z","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","level":"high"}],"cwes":["CWE-416"],"updated_at":"2026-11-02T15:05:35.156514Z"}],"nvd":[{"id":"CVE-2026-20870","description":"Use after free in Windows Win32K - ICOMP allows an authorized attacker to elevate privileges locally.","status":"published","published":"2026-01-13T18:16:16.65Z","modified":"2026-07-30T21:17:06.5Z","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-416"],"updated_at":"2026-11-02T14:12:03.683495Z"}]}}