{"id":"CVE-2026-54998","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-54998","summary":"Incorrect authorization in Microsoft Exchange Online allows an authorized attacker to elevate privileges over a network.","details":"Incorrect authorization in Microsoft Exchange Online allows an authorized attacker to elevate privileges over a network.","published":"2026-07-02T23:16:51.137","modified":"2026-07-07T05:16:52.423","cvss":{"score":8.8,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":1,"affectedPackages":[],"fix":null,"references":[{"type":"ADVISORY","url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-54998"}],"provenance":{"sources":["OSV.dev","NVD","FIRST.org (EPSS)"],"lastVerified":"2026-07-07T05:16:52.423"}}