{"id":"CVE-2026-54998","title":"Microsoft Exchange Online Elevation of Privilege Vulnerability","summary":"Incorrect authorization in Microsoft Exchange Online allows an authorized attacker to elevate privileges over a network.","severity":"high","cvss":8.8,"cvssVector":"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","cvssSource":"cna","cwe":["CWE-863"],"vendor":"Microsoft","product":"Microsoft Exchange Online","affected":["exchange_online -"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-07-06T00:00:00+00:00"},"exploitAvailable":true,"published":"2026-07-02","updated":"2026-09-17","sourceUpdated":"2026-09-17T22:28:22.495Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-54998","references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-54998","label":"Microsoft Exchange Online Elevation of Privilege Vulnerability"}],"tags":["cve.org","exploit-available"],"epss":0.00778,"epssPercentile":0.53925,"exploits":{"github":1,"githubRepos":["https://github.com/sentinel-aidefense/CVE-2026-54998-exp"],"checkedAt":"2026-09-25T08:21:02.975Z"},"ingestedAt":"2026-09-08T17:06:31.933Z","slug":"CVE-2026-54998","body":"## Overview\n\nIncorrect authorization in Microsoft Exchange Online allows an authorized attacker to elevate privileges over a network.\n\n## Affected\n\n- `exchange_online -`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"midnight","depthScore":61,"depthScoreParts":{"impact":48.4,"likelihood":0.2,"exploitation":12,"ransomware":0},"changes":[]}