{"id":"CVE-2026-55007","aliases":["EUVD-2026-73178","GHSA-phwr-836j-jgp8"],"status":"published","title":"Microsoft Exchange Server Remote Code Execution Vulnerability","description":"Double free in Microsoft Exchange Server allows an unauthorized attacker to execute code over a network.","severity":{"version":"3.1","score":8.1,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.00707,"percentile":0.53717,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-415"],"published":"2026-09-08T17:10:39Z","modified":"2026-10-31T16:09:29Z","products":[{"vendor":"microsoft","product":"exchange_server"},{"vendor":"microsoft","product":"exchange_server_subscription_edition"},{"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-2026-55007","tags":["vendor-advisory","patch","Patch","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-55007"},{"url":"https://github.com/advisories/GHSA-phwr-836j-jgp8"}],"sources":{"cve":[{"id":"CVE-2026-55007","title":"Microsoft Exchange Server Remote Code Execution Vulnerability","description":"Double free in Microsoft Exchange Server allows an unauthorized attacker to execute code over a network.","status":"published","published":"2026-09-08T17:10:39.617Z","modified":"2026-10-31T16:09:29.802Z","cvss":[{"version":"3.1","score":8.1,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C","level":"high","assessor":"cna"}],"cwes":["CWE-415"],"updated_at":"2026-11-02T14:20:11.925815Z"}],"euvd":[{"id":"EUVD-2026-73178","description":"Double free in Microsoft Exchange Server allows an unauthorized attacker to execute code over a network.","status":"published","published":"2026-09-08T17:10:39Z","modified":"2026-10-31T16:09:29Z","cvss":[{"version":"3.1","score":8.1,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C","level":"high"}],"updated_at":"2026-11-02T16:59:00.503345Z"}],"ghsa":[{"id":"GHSA-phwr-836j-jgp8","title":"Double free in Microsoft Exchange Server allows an unauthorized attacker to execute code over a...","description":"Double free in Microsoft Exchange Server allows an unauthorized attacker to execute code over a network.","status":"published","published":"2026-09-08T18:32:02Z","modified":"2026-09-08T18:32:09Z","cvss":[{"version":"3.1","score":8.1,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"cwes":["CWE-415"],"updated_at":"2026-11-02T15:11:29.303164Z"}],"nvd":[{"id":"CVE-2026-55007","description":"Double free in Microsoft Exchange Server allows an unauthorized attacker to execute code over a network.","status":"published","published":"2026-09-08T18:17:41.82Z","modified":"2026-10-05T17:11:46.14Z","cvss":[{"version":"3.1","score":8.1,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"secondary"}],"cwes":["CWE-415"],"updated_at":"2026-11-02T14:12:44.436435Z"}]}}