{"id":"CVE-2026-50312","published":"2026-07-14T17:06:43Z","modified":"2026-10-28T20:03:24Z","title":"Windows Ancillary Function Driver for WinSock Elevation of Privilege Vulnerability","vendor":"Microsoft","product":"Windows 10 Version 1607","tier":"tail","description":{"text":"Use after free in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.","provenance":"source","from":"CVE.org"},"cvss":{"score":4.7,"severity":"MEDIUM","version":"3.1","vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C","provenance":"source","from":"CVE.org CNA"},"epss":{"score":0.0035,"percentile":0.28587,"provenance":"source"},"cwes":[{"id":"CWE-416","name":"Use After Free"}],"references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50312","tags":["vendor-advisory","patch"]}],"priority":{"score":9.0,"factors":[{"name":"EPSS percentile","points":5.72},{"name":"CVSS severity","points":3.29}]},"vendorSlug":"microsoft","affectedVersions":[{"vendor":"Microsoft","product":"Windows 10 Version 1607","versions":[">= 10.0.14393.0, < 10.0.14393.9339"]},{"vendor":"Microsoft","product":"Windows 10 Version 1809","versions":[">= 10.0.17763.0, < 10.0.17763.9020"]},{"vendor":"Microsoft","product":"Windows 10 Version 21H2","versions":[">= 10.0.19044.0, < 10.0.19044.7548"]},{"vendor":"Microsoft","product":"Windows 10 Version 22H2","versions":[">= 10.0.19045.0, < 10.0.19045.7548"]},{"vendor":"Microsoft","product":"Windows 11 Version 24H2","versions":[">= 10.0.26100.0, < 10.0.26100.8875"]},{"vendor":"Microsoft","product":"Windows 11 Version 25H2","versions":[">= 10.0.26200.0, < 10.0.26200.8875"]},{"vendor":"Microsoft","product":"Windows 11 version 26H1","versions":[">= 10.0.28000.0, < 10.0.28000.2525"]},{"vendor":"Microsoft","product":"Windows Server 2012","versions":[">= 6.2.9200.0, < 6.2.9200.26226"]},{"vendor":"Microsoft","product":"Windows Server 2012 (Server Core installation)","versions":[">= 6.2.9200.0, < 6.2.9200.26226"]},{"vendor":"Microsoft","product":"Windows Server 2012 R2","versions":[">= 6.3.9600.0, < 6.3.9600.23291"]}],"euvd":{"id":"EUVD-2026-43888","exploited":false,"provenance":"source"},"lineage":{"familyId":"fam-class-microsoft-windows-cwe-416"}}