{"id":"CVE-2026-84011","aliases":["EUVD-2026-99449","GHSA-vpw4-8hvr-46cq"],"status":"published","title":"Windows SMB Client Security Feature Bypass Vulnerability","description":"Incorrect authorization in Windows SMB Client allows an authorized attacker to bypass a security feature locally.","severity":{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N/E:U/RL:O/RC:C","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00281,"percentile":0.20905,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-863"],"published":"2026-10-13T18:59:59Z","modified":"2026-11-10T20:37:16Z","products":[{"vendor":"microsoft","product":"windows 11 version 23h2"},{"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 2022"},{"vendor":"microsoft","product":"windows server 2025"},{"vendor":"microsoft","product":"windows server 2025 (server core installation)"},{"vendor":"microsoft","product":"windows_11_23h2"},{"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_2022"},{"vendor":"microsoft","product":"windows_server_2025"}],"references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-84011","tags":["vendor-advisory","patch","Vendor Advisory","Patch"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-84011"},{"url":"https://github.com/advisories/GHSA-vpw4-8hvr-46cq"}],"sources":{"cve":[{"id":"CVE-2026-84011","title":"Windows SMB Client Security Feature Bypass Vulnerability","description":"Incorrect authorization in Windows SMB Client allows an authorized attacker to bypass a security feature locally.","status":"published","published":"2026-10-13T18:59:59.723Z","modified":"2026-11-10T20:37:16.742Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N/E:U/RL:O/RC:C","level":"medium","assessor":"cna"}],"cwes":["CWE-863"],"updated_at":"2026-11-10T22:18:29.471829Z"}],"euvd":[{"id":"EUVD-2026-99449","description":"Incorrect authorization in Windows SMB Client allows an authorized attacker to bypass a security feature locally.","status":"published","published":"2026-10-13T18:59:59Z","modified":"2026-11-10T20:37:16Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N/E:U/RL:O/RC:C","level":"medium"}],"updated_at":"2026-11-10T21:23:21.470164Z"}],"ghsa":[{"id":"GHSA-vpw4-8hvr-46cq","title":"Incorrect authorization in Windows SMB Client allows an authorized attacker to bypass a security...","description":"Incorrect authorization in Windows SMB Client allows an authorized attacker to bypass a security feature locally.","status":"published","published":"2026-10-13T21:35:15Z","modified":"2026-10-13T21:35:23Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N","level":"medium"}],"cwes":["CWE-863"],"updated_at":"2026-11-02T15:13:17.40783Z"}],"nvd":[{"id":"CVE-2026-84011","description":"Incorrect authorization in Windows SMB Client allows an authorized attacker to bypass a security feature locally.","status":"published","published":"2026-10-13T19:20:51.077Z","modified":"2026-10-19T18:49:32.607Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N","level":"medium","assessor":"secondary"}],"cwes":["CWE-863"],"updated_at":"2026-11-02T14:12:58.13117Z"}]}}