{"id":"CVE-2026-50343","published":"2026-07-14T17:06:35Z","modified":"2026-10-28T20:03:17Z","title":"Microsoft Install Service Elevation of Privilege Vulnerability","vendor":"Microsoft","product":"Windows 10 Version 1809","tier":"tail","description":{"text":"Improper privilege management in Microsoft Install Service allows an authorized attacker to elevate privileges locally.","provenance":"source","from":"CVE.org"},"cvss":{"score":7.8,"severity":"HIGH","version":"3.1","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","provenance":"source","from":"CVE.org CNA"},"epss":{"score":0.00298,"percentile":0.22416,"provenance":"source"},"cwes":[{"id":"CWE-269","name":"Improper Privilege Management"}],"references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50343","tags":["vendor-advisory","patch"]}],"priority":{"score":14.9,"factors":[{"name":"EPSS percentile","points":4.48},{"name":"Public exploit code","points":5.0},{"name":"CVSS severity","points":5.46}]},"exploitSources":{"pocGithub":{"count":1,"skipped":0,"earliest":"2026-06-03","earliestUrl":"https://github.com/Rat5ak/CVE-2026-50343-InstallService-EoP","repos":[{"name":"Rat5ak/CVE-2026-50343-InstallService-EoP","url":"https://github.com/Rat5ak/CVE-2026-50343-InstallService-EoP","stars":48,"created":"2026-06-03"}]},"first":{"date":"2026-06-03","source":"PoC-in-GitHub","url":"https://github.com/Rat5ak/CVE-2026-50343-InstallService-EoP"},"provenance":"source"},"vendorSlug":"microsoft","affectedVersions":[{"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 2019","versions":[">= 10.0.17763.0, < 10.0.17763.9020"]},{"vendor":"Microsoft","product":"Windows Server 2019 (Server Core installation)","versions":[">= 10.0.17763.0, < 10.0.17763.9020"]},{"vendor":"Microsoft","product":"Windows Server 2022","versions":[">= 10.0.20348.0, < 10.0.20348.5386"]},{"vendor":"Microsoft","product":"Windows Server 2025","versions":[">= 10.0.26100.0, < 10.0.26100.33158"]}],"euvd":{"id":"EUVD-2026-43876","exploited":false,"provenance":"source"},"lineage":{"familyId":"fam-class-microsoft-windows-cwe-269"}}