{"id":"CVE-2026-62799","aliases":["EUVD-2026-56660","GHSA-4ffr-gx27-qw7j"],"status":"published","title":"Windows SMB Client Elevation of Privilege Vulnerability","description":"Heap-based buffer overflow in Windows SMB Client 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":0.00333,"percentile":0.26858,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-122"],"published":"2026-08-11T17:06:12Z","modified":"2026-11-10T22:00:01Z","products":[{"vendor":"microsoft","product":"windows 11 version 26h1"},{"vendor":"microsoft","product":"windows_11_26h1"}],"references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62799","tags":["vendor-advisory","patch","Patch","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-62799"},{"url":"https://github.com/advisories/GHSA-4ffr-gx27-qw7j"}],"sources":{"cve":[{"id":"CVE-2026-62799","title":"Windows SMB Client Elevation of Privilege Vulnerability","description":"Heap-based buffer overflow in Windows SMB Client allows an authorized attacker to elevate privileges locally.","status":"published","published":"2026-08-11T17:06:12.165Z","modified":"2026-11-10T22:00:01.635Z","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-122"],"updated_at":"2026-11-10T22:48:51.483784Z"}],"euvd":[{"id":"EUVD-2026-56660","description":"Heap-based buffer overflow in Windows SMB Client allows an authorized attacker to elevate privileges locally.","status":"published","published":"2026-08-11T17:06:12Z","modified":"2026-11-10T22:00:01Z","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":"2026-11-10T23:24:16.815365Z"}],"ghsa":[{"id":"GHSA-4ffr-gx27-qw7j","title":"Heap-based buffer overflow in Windows SMB Client allows an authorized attacker to elevate...","description":"Heap-based buffer overflow in Windows SMB Client allows an authorized attacker to elevate privileges locally.","status":"published","published":"2026-08-11T18:31:23Z","modified":"2026-08-11T18:31:27Z","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-122"],"updated_at":"2026-11-02T15:10:19.387522Z"}],"nvd":[{"id":"CVE-2026-62799","description":"Heap-based buffer overflow in Windows SMB Client allows an authorized attacker to elevate privileges locally.","status":"published","published":"2026-08-11T17:18:34.18Z","modified":"2026-10-24T16:10:00.153Z","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-122"],"updated_at":"2026-11-02T14:12:36.499002Z"}]}}