{"id":"CVE-2026-45503","title":"Improper authorization in Microsoft Exchange Server allows an authorized attacker to disclose information over a network.","summary":"Improper authorization in Microsoft Exchange Server allows an authorized attacker to disclose information over a network.","severity":"high","cvss":8.1,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N","cwe":["CWE-285","CWE-918"],"vendor":"microsoft","product":"exchange_server","affected":["exchange_server = 2016","exchange_server = 2019","exchange_server_subscription_edition < 15.02.2562.043"],"patched":["exchange_server_subscription_edition 15.02.2562.043"],"published":"2026-06-09","updated":"2026-07-28","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-45503","references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45503","label":"secure@microsoft.com"}],"tags":["nvd"],"epss":0.00445,"epssPercentile":0.37987,"ingestedAt":"2026-07-28T23:40:23.593Z","slug":"CVE-2026-45503","body":"## Overview\n\nImproper authorization in Microsoft Exchange Server allows an authorized attacker to disclose information over a network.\n\n## Affected\n\n- `exchange_server = 2016`\n- `exchange_server = 2019`\n- `exchange_server_subscription_edition < 15.02.2562.043`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `exchange_server_subscription_edition 15.02.2562.043`","depth":"twilight","depthScore":45,"depthScoreParts":{"impact":44.6,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}