{"id":"CVE-2026-77910","aliases":[],"title":"Microsoft Exchange Server Elevation of Privilege Vulnerability","titleSource":"microsoft","descriptionSource":"microsoft","products":[{"vendor":"Microsoft","name":"Microsoft Exchange Server 2016 Cumulative Update 23","platforms":["x64-based Systems"],"versions":[{"version":"15.01.0.0","status":"affected","lessThan":"15.01.2507.077","versionType":"custom"}],"source":"microsoft","url":"https://www.cve.org/CVERecord?id=CVE-2026-77910"},{"vendor":"Microsoft","name":"Microsoft Exchange Server 2019 Cumulative Update 14","platforms":["x64-based Systems"],"versions":[{"version":"15.02.0.0","status":"affected","lessThan":"15.02.1544.050","versionType":"custom"}],"source":"microsoft","url":"https://www.cve.org/CVERecord?id=CVE-2026-77910"},{"vendor":"Microsoft","name":"Microsoft Exchange Server 2019 Cumulative Update 15","platforms":["x64-based Systems"],"versions":[{"version":"15.02.0.0","status":"affected","lessThan":"15.02.1748.055","versionType":"custom"}],"source":"microsoft","url":"https://www.cve.org/CVERecord?id=CVE-2026-77910"},{"vendor":"Microsoft","name":"Microsoft Exchange Server Subscription Edition RTM","platforms":["x64-based Systems"],"versions":[{"version":"15.02.0.0","status":"affected","lessThan":"15.02.2562.056","versionType":"custom"}],"source":"microsoft","url":"https://www.cve.org/CVERecord?id=CVE-2026-77910"}],"remediation":[],"description":"Incorrect authorization in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.","severity":"high","score":8.8,"published":"2026-10-13T19:01:10.280Z","modified":"2026-10-27T21:34:08.431Z","withdrawn":false,"knownExploited":false,"affected":[],"references":["https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-77910"],"sources":[{"name":"CVE","id":"CVE-2026-77910","modified":"2026-10-27T21:34:08.431Z","url":"https://www.cve.org/CVERecord?id=CVE-2026-77910"}],"assessments":[{"source":"microsoft","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","score":8.8}],"sourceAffected":[],"kev":{"status":"not-listed","checkedAt":"2026-10-28T19:10:31.056Z"},"coverage":[{"source":"NVD","status":"not-checked"},{"source":"GHSA","status":"not-checked"},{"source":"EUVD","status":"not-checked"},{"source":"EPSS","status":"not-checked"}],"evidence":[]}