{"id":"CVE-2026-77910","aliases":["EUVD-2026-100140","GHSA-8324-3q3h-54w9"],"status":"published","title":"Microsoft Exchange Server Elevation of Privilege Vulnerability","description":"Incorrect authorization 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":"2026-11-09","score":0.00867,"percentile":0.58983,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-863"],"published":"2026-10-13T19:01:10Z","modified":"2026-10-31T18:10:24Z","products":[{"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-2026-77910","tags":["vendor-advisory","patch"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-77910"},{"url":"https://github.com/advisories/GHSA-8324-3q3h-54w9"}],"sources":{"cve":[{"id":"CVE-2026-77910","title":"Microsoft Exchange Server Elevation of Privilege Vulnerability","description":"Incorrect authorization in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.","status":"published","published":"2026-10-13T19:01:10.28Z","modified":"2026-10-31T18:10:24.092Z","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-863"],"updated_at":"2026-11-02T14:20:16.072351Z"}],"euvd":[{"id":"EUVD-2026-100140","description":"Incorrect authorization in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.","status":"published","published":"2026-10-13T19:01:10Z","modified":"2026-10-31T18:10:24Z","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":"2026-11-02T16:58:51.754038Z"}],"ghsa":[{"id":"GHSA-8324-3q3h-54w9","title":"Incorrect authorization in Microsoft Exchange Server allows an authorized attacker to elevate...","description":"Incorrect authorization in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.","status":"published","published":"2026-10-13T21:34:23Z","modified":"2026-10-13T21:34:29Z","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-863"],"updated_at":"2026-11-02T15:13:15.646152Z"}],"nvd":[{"id":"CVE-2026-77910","description":"Incorrect authorization in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.","status":"published","published":"2026-10-13T19:19:54.057Z","modified":"2026-10-14T04:18:36.717Z","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-863"],"updated_at":"2026-11-02T14:12:57.603498Z"}]}}