{"id":"CVE-2026-96940","aliases":["EUVD-2026-91771","GHSA-q9jh-jffv-9xvh"],"status":"published","title":"Microsoft Exchange Server Elevation of Privilege Vulnerability","description":"Weak authentication in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.","severity":{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/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":"2026-11-12","score":0.02749,"percentile":0.8641,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":true,"fix_available":false},"cwes":["CWE-1390"],"published":"2026-10-02T19:06:19Z","modified":"2026-11-10T20:40:39Z","exploits":[{"source":"pocgithub","id":"HORKimhab/CVE-2026-96940","title":"HORKimhab/CVE-2026-96940","date":"2026-10-06","url":"https://github.com/HORKimhab/CVE-2026-96940"}],"products":[{"vendor":"microsoft","product":"exchange_server"},{"vendor":"microsoft","product":"exchange_server_subscription_edition"},{"vendor":"microsoft","product":"microsoft exchange server 2016 cumulative update 23"},{"vendor":"microsoft","product":"microsoft exchange server 2019 cumulative update 14"},{"vendor":"microsoft","product":"microsoft exchange server 2019 cumulative update 15"},{"vendor":"microsoft","product":"microsoft exchange server subscription edition rtm"}],"references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-96940","tags":["vendor-advisory","patch","Patch","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-96940"},{"url":"https://github.com/advisories/GHSA-q9jh-jffv-9xvh"}],"sources":{"cve":[{"id":"CVE-2026-96940","title":"Microsoft Exchange Server Elevation of Privilege Vulnerability","description":"Weak authentication in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.","status":"published","published":"2026-10-02T19:06:19.061Z","modified":"2026-11-10T20:40:39.51Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/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-1390"],"updated_at":"2026-11-10T22:18:30.298108Z"}],"euvd":[{"id":"EUVD-2026-91771","description":"Weak authentication in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.","status":"published","published":"2026-10-02T19:06:19Z","modified":"2026-11-10T20:40:39Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C","level":"high"}],"updated_at":"2026-11-10T22:23:58.54025Z"}],"ghsa":[{"id":"GHSA-q9jh-jffv-9xvh","title":"Weak authorization in Microsoft Exchange Server allows an authenticated attacker to elevate...","description":"Weak authorization in Microsoft Exchange Server allows an authenticated attacker to elevate privileges over a network.","status":"published","published":"2026-10-02T21:32:05Z","modified":"2026-10-02T21:32:13Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"cwes":["CWE-1390"],"updated_at":"2026-11-02T15:12:43.646433Z"}],"nvd":[{"id":"CVE-2026-96940","description":"Weak authentication in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.","status":"published","published":"2026-10-02T19:16:43.023Z","modified":"2026-10-15T02:35:54.01Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"secondary"}],"cwes":["CWE-1390"],"updated_at":"2026-11-02T14:12:53.75133Z"}]}}