{"id":"CVE-2026-20842","published":"2026-01-13T17:56:27Z","modified":"2026-07-30T20:46:44Z","title":"Microsoft DWM Core Library Elevation of Privilege Vulnerability","vendor":"Microsoft","product":"Windows 10 Version 21H2","tier":"tail","description":{"text":"Use after free in Windows DWM allows an authorized attacker to elevate privileges locally.","provenance":"source","from":"CVE.org"},"cvss":{"score":7,"severity":"HIGH","version":"3.1","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","provenance":"source","from":"CVE.org CNA"},"epss":{"score":0.00386,"percentile":0.32569,"provenance":"source"},"cwes":[{"id":"CWE-416","name":"Use After Free"}],"references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20842","tags":["vendor-advisory","patch"]}],"priority":{"score":11.4,"factors":[{"name":"EPSS percentile","points":6.51},{"name":"CVSS severity","points":4.9}]},"vendorSlug":"microsoft","affectedVersions":[{"vendor":"Microsoft","product":"Windows 10 Version 21H2","versions":[">= 10.0.19044.0, < 10.0.19044.6809"]},{"vendor":"Microsoft","product":"Windows 10 Version 22H2","versions":[">= 10.0.19045.0, < 10.0.19045.6809"]},{"vendor":"Microsoft","product":"Windows 11 version 23H2","versions":[">= 10.0.22631.0, < 10.0.22631.6491"]},{"vendor":"Microsoft","product":"Windows 11 Version 23H2","versions":[">= 10.0.22631.0, < 10.0.22631.6491"]},{"vendor":"Microsoft","product":"Windows 11 Version 24H2","versions":[">= 10.0.26100.0, < 10.0.26100.7623"]},{"vendor":"Microsoft","product":"Windows 11 Version 25H2","versions":[">= 10.0.26200.0, < 10.0.26200.7623"]},{"vendor":"Microsoft","product":"Windows Server 2022","versions":[">= 10.0.20348.0, < 10.0.20348.4648"]},{"vendor":"Microsoft","product":"Windows Server 2022, 23H2 Edition (Server Core installation)","versions":[">= 10.0.25398.0, < 10.0.25398.2092"]},{"vendor":"Microsoft","product":"Windows Server 2025","versions":[">= 10.0.26100.0, < 10.0.26100.32230"]},{"vendor":"Microsoft","product":"Windows Server 2025 (Server Core installation)","versions":[">= 10.0.26100.0, < 10.0.26100.32230"]}],"euvd":{"id":"EUVD-2026-2181","exploited":false,"provenance":"source"},"lineage":{"familyId":"fam-class-microsoft-windows-cwe-416"}}