{"id":"CVE-2026-50343","aliases":["EUVD-2026-43876","GHSA-hpv9-6w7w-qfg9"],"status":"published","title":"Microsoft Install Service Elevation of Privilege Vulnerability","description":"Improper privilege management in Microsoft Install Service allows an authorized attacker to elevate privileges locally.","severity":{"version":"3.1","score":7.8,"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","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.00298,"percentile":0.22673,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":true,"fix_available":false},"cwes":["CWE-269"],"published":"2026-07-14T17:06:35Z","modified":"2026-11-01T17:34:10Z","exploits":[{"source":"pocgithub","id":"Rat5ak/CVE-2026-50343-InstallService-EoP","title":"Rat5ak/CVE-2026-50343-InstallService-EoP","date":"2026-06-03","url":"https://github.com/Rat5ak/CVE-2026-50343-InstallService-EoP"}],"products":[{"vendor":"microsoft","product":"windows 10 version 1809"},{"vendor":"microsoft","product":"windows 10 version 21h2"},{"vendor":"microsoft","product":"windows 10 version 22h2"},{"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 server 2019"},{"vendor":"microsoft","product":"windows server 2019 (server core installation)"},{"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_10_1809"},{"vendor":"microsoft","product":"windows_10_21h2"},{"vendor":"microsoft","product":"windows_10_22h2"},{"vendor":"microsoft","product":"windows_11_24h2"},{"vendor":"microsoft","product":"windows_11_25h2"},{"vendor":"microsoft","product":"windows_11_26h1"},{"vendor":"microsoft","product":"windows_server_2019"},{"vendor":"microsoft","product":"windows_server_2022"},{"vendor":"microsoft","product":"windows_server_2025"}],"references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50343","tags":["vendor-advisory","patch","Patch","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-50343"},{"url":"https://github.com/advisories/GHSA-hpv9-6w7w-qfg9"}],"sources":{"cve":[{"id":"CVE-2026-50343","title":"Microsoft Install Service Elevation of Privilege Vulnerability","description":"Improper privilege management in Microsoft Install Service allows an authorized attacker to elevate privileges locally.","status":"published","published":"2026-07-14T17:06:35.076Z","modified":"2026-11-01T17:34:10.64Z","cvss":[{"version":"3.1","score":7.8,"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","level":"high","assessor":"cna"}],"cwes":["CWE-269"],"updated_at":"2026-11-02T14:20:09.098623Z"}],"euvd":[{"id":"EUVD-2026-43876","description":"Improper privilege management in Microsoft Install Service allows an authorized attacker to elevate privileges locally.","status":"published","published":"2026-07-14T17:06:35Z","modified":"2026-11-01T17:34:10Z","cvss":[{"version":"3.1","score":7.8,"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","level":"high"}],"updated_at":"2026-11-02T16:58:48.316156Z"}],"ghsa":[{"id":"GHSA-hpv9-6w7w-qfg9","title":"Improper privilege management in Microsoft Install Service allows an authorized attacker to...","description":"Improper privilege management in Microsoft Install Service allows an authorized attacker to elevate privileges locally.","status":"published","published":"2026-07-14T18:32:16Z","modified":"2026-07-14T18:32:22Z","cvss":[{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"cwes":["CWE-269"],"updated_at":"2026-11-02T15:09:29.53235Z"}],"nvd":[{"id":"CVE-2026-50343","description":"Improper privilege management in Microsoft Install Service allows an authorized attacker to elevate privileges locally.","status":"published","published":"2026-07-14T18:17:33.973Z","modified":"2026-07-22T16:17:42.747Z","cvss":[{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"secondary"}],"cwes":["CWE-269"],"updated_at":"2026-11-02T14:12:29.489525Z"}]}}