{"id":"CVE-2026-77910","revision":"83d157f127a54264bad878fd7d705b49","records":[{"revision":"83d157f127a54264bad878fd7d705b49","observedAt":"2026-10-23T18:48:20.63+00:00","statement":{"source":"cve-program","id":"CVE-2026-77910","aliases":[],"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.","state":0,"publishedAt":"2026-10-13T19:01:10.28+00:00","modifiedAt":"2026-10-23T17:52:53.392+00:00","affected":[{"ecosystem":"Vendor product","name":"Microsoft Exchange Server 2016 Cumulative Update 23","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"Microsoft\",\n                    \"product\": \"Microsoft Exchange Server 2016 Cumulative Update 23\",\n                    \"platforms\": [\n                        \"x64-based Systems\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"15.01.0.0\",\n                            \"lessThan\": \"15.01.2507.077\",\n                            \"versionType\": \"custom\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Microsoft Exchange Server 2019 Cumulative Update 14","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"Microsoft\",\n                    \"product\": \"Microsoft Exchange Server 2019 Cumulative Update 14\",\n                    \"platforms\": [\n                        \"x64-based Systems\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"15.02.0.0\",\n                            \"lessThan\": \"15.02.1544.050\",\n                            \"versionType\": \"custom\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Microsoft Exchange Server 2019 Cumulative Update 15","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"Microsoft\",\n                    \"product\": \"Microsoft Exchange Server 2019 Cumulative Update 15\",\n                    \"platforms\": [\n                        \"x64-based Systems\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"15.02.0.0\",\n                            \"lessThan\": \"15.02.1748.055\",\n                            \"versionType\": \"custom\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Microsoft Exchange Server Subscription Edition RTM","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"Microsoft\",\n                    \"product\": \"Microsoft Exchange Server Subscription Edition RTM\",\n                    \"platforms\": [\n                        \"x64-based Systems\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"15.02.0.0\",\n                            \"lessThan\": \"15.02.2562.056\",\n                            \"versionType\": \"custom\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","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,"severity":"HIGH"}],"references":["https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-77910"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-77910","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-77910","identifiers":["CVE-2026-77910"]},"retained":false,"historicalAffected":[]}],"coverage":[]}