{"id":"CVE-2026-54998","aliases":["EUVD-2026-41446","GHSA-phr2-vr74-whpx"],"status":"published","title":"Microsoft Exchange Online Elevation of Privilege Vulnerability","description":"Incorrect authorization in Microsoft Exchange Online allows an authorized attacker to elevate privileges over a network.","severity":{"version":"3.1","score":8.8,"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","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.00778,"percentile":0.56354,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":true,"fix_available":false},"cwes":["CWE-863"],"published":"2026-07-02T22:18:58Z","modified":"2026-11-10T22:34:54Z","exploits":[{"source":"pocgithub","id":"sentinel-aidefense/CVE-2026-54998-exp","title":"sentinel-aidefense/CVE-2026-54998-exp","date":"2026-07-04","url":"https://github.com/sentinel-aidefense/CVE-2026-54998-exp"}],"products":[{"vendor":"","product":"microsoft exchange online"},{"vendor":"microsoft","product":"exchange_online"},{"vendor":"microsoft","product":"microsoft exchange online"}],"references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-54998","tags":["vendor-advisory","patch","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-54998"},{"url":"https://github.com/advisories/GHSA-phr2-vr74-whpx"}],"sources":{"cve":[{"id":"CVE-2026-54998","title":"Microsoft Exchange Online Elevation of Privilege Vulnerability","description":"Incorrect authorization in Microsoft Exchange Online allows an authorized attacker to elevate privileges over a network.","status":"published","published":"2026-07-02T22:18:58.222Z","modified":"2026-11-10T22:34:54.433Z","cvss":[{"version":"3.1","score":8.8,"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","level":"high","assessor":"cna"}],"cwes":["CWE-863"],"updated_at":"2026-11-10T23:49:29.024872Z"}],"euvd":[{"id":"EUVD-2026-41446","description":"Incorrect authorization in Microsoft Exchange Online allows an authorized attacker to elevate privileges over a network.","status":"published","published":"2026-07-02T22:18:58Z","modified":"2026-11-10T22:34:54Z","cvss":[{"version":"3.1","score":8.8,"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","level":"high"}],"updated_at":"2026-11-10T23:24:16.163953Z"}],"ghsa":[{"id":"GHSA-phr2-vr74-whpx","title":"Incorrect authorization in Microsoft Exchange Online allows an authorized attacker to elevate...","description":"Incorrect authorization in Microsoft Exchange Online allows an authorized attacker to elevate privileges over a network.","status":"published","published":"2026-07-03T00:31:53Z","modified":"2026-07-03T00:31:57Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"cwes":["CWE-863"],"updated_at":"2026-11-02T15:09:13.018027Z"}],"nvd":[{"id":"CVE-2026-54998","description":"Incorrect authorization in Microsoft Exchange Online allows an authorized attacker to elevate privileges over a network.","status":"published","published":"2026-07-02T23:16:51.137Z","modified":"2026-10-25T21:10:00.77Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"secondary"}],"cwes":["CWE-863"],"updated_at":"2026-11-02T14:12:27.541515Z"}]}}