{"id":"CVE-2026-83657","aliases":["EUVD-2026-99318","GHSA-xpx6-rc5v-vgmh"],"status":"published","title":"Windows Modern Device Management (MDM) Tampering Vulnerability","description":"Weak authentication in Windows Modern Device Management (MDM) allows an authorized attacker to perform tampering locally.","severity":{"version":"3.1","score":5.5,"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","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.00274,"percentile":0.2008,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-1390"],"published":"2026-10-13T18:59:47Z","modified":"2026-11-10T20:36:05Z","products":[{"vendor":"microsoft","product":"windows 10 version 1809"},{"vendor":"microsoft","product":"windows server 2019"},{"vendor":"microsoft","product":"windows server 2019 (server core installation)"},{"vendor":"microsoft","product":"windows_10_1809"},{"vendor":"microsoft","product":"windows_server_2019"}],"references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83657","tags":["vendor-advisory","patch","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-83657"},{"url":"https://github.com/advisories/GHSA-xpx6-rc5v-vgmh"}],"sources":{"cve":[{"id":"CVE-2026-83657","title":"Windows Modern Device Management (MDM) Tampering Vulnerability","description":"Weak authentication in Windows Modern Device Management (MDM) allows an authorized attacker to perform tampering locally.","status":"published","published":"2026-10-13T18:59:47.726Z","modified":"2026-11-10T20:36:05.248Z","cvss":[{"version":"3.1","score":5.5,"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","level":"medium","assessor":"cna"}],"cwes":["CWE-1390"],"updated_at":"2026-11-10T22:18:28.707469Z"}],"euvd":[{"id":"EUVD-2026-99318","description":"Weak authentication in Windows Modern Device Management (MDM) allows an authorized attacker to perform tampering locally.","status":"published","published":"2026-10-13T18:59:47Z","modified":"2026-11-10T20:36:05Z","cvss":[{"version":"3.1","score":5.5,"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","level":"medium"}],"updated_at":"2026-11-10T21:23:23.099302Z"}],"ghsa":[{"id":"GHSA-xpx6-rc5v-vgmh","title":"Weak authentication in Windows Modern Device Management (MDM) allows an authorized attacker to...","description":"Weak authentication in Windows Modern Device Management (MDM) allows an authorized attacker to perform tampering locally.","status":"published","published":"2026-10-13T21:34:34Z","modified":"2026-10-13T21:34:34Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N","level":"medium"}],"cwes":["CWE-1390"],"updated_at":"2026-11-02T15:13:16.244853Z"}],"nvd":[{"id":"CVE-2026-83657","description":"Weak authentication in Windows Modern Device Management (MDM) allows an authorized attacker to perform tampering locally.","status":"published","published":"2026-10-13T19:20:07.38Z","modified":"2026-10-29T18:23:43.89Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N","level":"medium","assessor":"secondary"}],"cwes":["CWE-1390"],"updated_at":"2026-11-02T14:12:57.603498Z"}]}}