{"id":"CVE-2026-105509","aliases":["EUVD-2026-121948","GHSA-8v46-7q6r-chj2"],"status":"published","title":"Windows Resilient File System (ReFS) Elevation of Privilege Vulnerability","description":"Use after free in Windows Resilient File System (ReFS) 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":"2026-11-14","score":0.00205,"percentile":0.10529,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-362","CWE-416"],"published":"2026-11-10T18:18:58Z","modified":"2026-11-10T21:32:24Z","products":[{"vendor":"microsoft","product":"windows 11 version 26h1"}],"references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-105509","tags":["vendor-advisory","patch"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-105509"},{"url":"https://github.com/advisories/GHSA-8v46-7q6r-chj2"}],"sources":{"cve":[{"id":"CVE-2026-105509","title":"Windows Resilient File System (ReFS) Elevation of Privilege Vulnerability","description":"Use after free in Windows Resilient File System (ReFS) allows an authorized attacker to elevate privileges locally.","status":"published","published":"2026-11-10T18:18:58.524Z","modified":"2026-11-13T18:07:48.127Z","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","CWE-362"],"updated_at":"2026-11-10T19:39:57.855077Z"}],"euvd":[{"id":"EUVD-2026-121948","description":"Use after free in Windows Resilient File System (ReFS) allows an authorized attacker to elevate privileges locally.","status":"published","published":"2026-11-10T18:18:58Z","modified":"2026-11-13T18:07:48Z","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":"2026-11-10T23:24:26.602648Z"}],"ghsa":[{"id":"GHSA-8v46-7q6r-chj2","title":"Use after free in Windows Resilient File System (ReFS) allows an authorized attacker to elevate...","description":"Use after free in Windows Resilient File System (ReFS) allows an authorized attacker to elevate privileges locally.","status":"published","published":"2026-11-10T21:32:19Z","modified":"2026-11-10T21:32:24Z","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-362"],"updated_at":"2026-11-10T21:57:47.623655Z"}],"nvd":[{"id":"CVE-2026-105509","description":"Use after free in Windows Resilient File System (ReFS) allows an authorized attacker to elevate privileges locally.","status":"published","published":"2026-11-10T19:17:49.687Z","modified":"2026-11-10T22:18:13.913Z","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-362","CWE-416"],"updated_at":"2026-11-11T00:21:53.860815Z"}]}}