{"id":"CVE-2026-45503","aliases":["EUVD-2026-35679","GHSA-p44w-fhq3-v2jv"],"status":"published","title":"Microsoft Exchange Server Information Disclosure Vulnerability","description":"Improper authorization in Microsoft Exchange Server allows an authorized attacker to disclose information over a network.","severity":{"version":"3.1","score":8.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.00445,"percentile":0.3898,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-285","CWE-918"],"published":"2026-06-09T17:04:46Z","modified":"2026-09-24T13:43:48Z","products":[{"vendor":"microsoft","product":"exchange_server"},{"vendor":"microsoft","product":"exchange_server_subscription_edition"},{"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-2026-45503","tags":["vendor-advisory","patch","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-45503"},{"url":"https://github.com/advisories/GHSA-p44w-fhq3-v2jv"}],"sources":{"cve":[{"id":"CVE-2026-45503","title":"Microsoft Exchange Server Information Disclosure Vulnerability","description":"Improper authorization in Microsoft Exchange Server allows an authorized attacker to disclose information over a network.","status":"published","published":"2026-06-09T17:04:46.795Z","modified":"2026-09-24T13:43:48.266Z","cvss":[{"version":"3.1","score":8.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C","level":"high","assessor":"cna"}],"cwes":["CWE-285"],"updated_at":"2026-11-02T13:46:43.922571Z"}],"euvd":[{"id":"EUVD-2026-35679","description":"Improper authorization in Microsoft Exchange Server allows an authorized attacker to disclose information over a network.","status":"published","published":"2026-06-09T17:04:46Z","modified":"2026-09-24T13:43:48Z","cvss":[{"version":"3.1","score":8.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C","level":"high"}],"updated_at":"2026-11-02T17:27:59.112143Z"}],"ghsa":[{"id":"GHSA-p44w-fhq3-v2jv","title":"Improper authorization in Microsoft Exchange Server allows an authorized attacker to disclose...","description":"Improper authorization in Microsoft Exchange Server allows an authorized attacker to disclose information over a network.","status":"published","published":"2026-06-09T18:30:50Z","modified":"2026-06-15T21:31:33Z","cvss":[{"version":"3.1","score":8.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N","level":"high"}],"cwes":["CWE-285","CWE-918"],"updated_at":"2026-11-02T15:08:48.16867Z"}],"nvd":[{"id":"CVE-2026-45503","description":"Improper authorization in Microsoft Exchange Server allows an authorized attacker to disclose information over a network.","status":"published","published":"2026-06-09T17:17:26.137Z","modified":"2026-07-28T23:16:58.96Z","cvss":[{"version":"3.1","score":8.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N","level":"high","assessor":"secondary"},{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-285","CWE-918"],"updated_at":"2026-11-02T14:12:23.109705Z"}]}}