{"id":"CVE-2026-62911","title":"Microsoft Exchange Server Elevation of Privilege Vulnerability","summary":"Authentication bypass by capture-replay in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.","severity":"high","cvss":8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C","cvssSource":"cna","cwe":["CWE-294"],"vendor":"Microsoft","product":"Microsoft Exchange Server 2016 Cumulative Update 23","affected":["exchange_server_2016_cumulative_update_23 >= 15.01.0.0 < 15.01.2507.072","exchange_server_2019_cumulative_update_14 >= 15.02.0.0 < 15.02.1544.044","exchange_server_2019_cumulative_update_15 >= 15.02.0.0 < 15.02.1748.049","exchange_server_subscription_edition_rtm >= 15.02.0.0 < 15.02.2562.046"],"ssvc":{"exploitation":"poc","automatable":"no","technicalImpact":"total","timestamp":"2026-08-06T00:00:00+00:00"},"exploitAvailable":true,"published":"2026-08-11","updated":"2026-09-24","sourceUpdated":"2026-09-24T13:46:41.032Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-62911","references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62911","label":"Microsoft Exchange Server Elevation of Privilege Vulnerability"}],"tags":["cve.org","exploit-available"],"epss":0.00694,"epssPercentile":0.50828,"exploits":{"github":1,"githubRepos":["https://github.com/hypnguyen1209/CVE-2026-62911"],"checkedAt":"2026-09-25T08:21:06.695Z"},"ingestedAt":"2026-09-08T18:07:34.890Z","slug":"CVE-2026-62911","body":"## Overview\n\nAuthentication bypass by capture-replay in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.\n\n## Affected\n\n- `exchange_server_2016_cumulative_update_23 >= 15.01.0.0 < 15.01.2507.072`\n- `exchange_server_2019_cumulative_update_14 >= 15.02.0.0 < 15.02.1544.044`\n- `exchange_server_2019_cumulative_update_15 >= 15.02.0.0 < 15.02.1748.049`\n- `exchange_server_subscription_edition_rtm >= 15.02.0.0 < 15.02.2562.046`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"midnight","depthScore":56,"depthScoreParts":{"impact":44,"likelihood":0.1,"exploitation":12,"ransomware":0},"changes":[]}