{"id":"CVE-2026-84011","published":"2026-10-13T18:59:59Z","modified":"2026-10-30T19:05:26Z","title":"Windows SMB Client Security Feature Bypass Vulnerability","vendor":"Microsoft","product":"Windows 11 version 23H2","tier":"tail","description":{"text":"Incorrect authorization in Windows SMB Client allows an authorized attacker to bypass a security feature locally.","provenance":"source","from":"CVE.org"},"cvss":{"score":5.5,"severity":"MEDIUM","version":"3.1","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","provenance":"source","from":"CVE.org CNA"},"epss":{"score":0.00281,"percentile":0.20695,"provenance":"source"},"cwes":[{"id":"CWE-863","name":"Incorrect Authorization"}],"references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-84011","tags":["vendor-advisory","patch"]}],"priority":{"score":8.0,"factors":[{"name":"EPSS percentile","points":4.14},{"name":"CVSS severity","points":3.85}]},"vendorSlug":"microsoft","affectedVersions":[{"vendor":"Microsoft","product":"Windows 11 version 23H2","versions":[">= 10.0.22631.0, < 10.0.22631.7652"]},{"vendor":"Microsoft","product":"Windows 11 Version 23H2","versions":[">= 10.0.22631.0, < 10.0.22631.7652"]},{"vendor":"Microsoft","product":"Windows 11 Version 24H2","versions":[">= 10.0.26100.0, < 10.0.26100.9711"]},{"vendor":"Microsoft","product":"Windows 11 Version 25H2","versions":[">= 10.0.26200.0, < 10.0.26200.9711"]},{"vendor":"Microsoft","product":"Windows 11 version 26H1","versions":[">= 10.0.28000.0, < 10.0.28000.3231"]},{"vendor":"Microsoft","product":"Windows 11 Version 26H2","versions":[">= 10.0.26300.0, < 10.0.26300.9711"]},{"vendor":"Microsoft","product":"Windows Server 2022","versions":[">= 10.0.20348.0, < 10.0.20348.5761"]},{"vendor":"Microsoft","product":"Windows Server 2025","versions":[">= 10.0.26100.0, < 10.0.26100.33650"]},{"vendor":"Microsoft","product":"Windows Server 2025 (Server Core installation)","versions":[">= 10.0.26100.0, < 10.0.26100.33650"]}],"euvd":{"id":"EUVD-2026-99449","exploited":false,"provenance":"source"},"lineage":{"familyId":"fam-class-microsoft-windows-cwe-863"}}