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CVE-2026-54998

HighPublished

Microsoft Exchange Online Elevation of Privilege Vulnerability

Published: Jul 2, 2026
Updated: Sep 17, 2026
Assigning CNA: microsoft
Evidence observed: Aug 8, 2026

Primary CVSS

8.8/ 10High

nvd · CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS probability estimate

0.8%

Low · next 30 days

Percentile: 53.9%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

Incorrect authorization in Microsoft Exchange Online allows an authorized attacker to elevate privileges over a network.

Sources

CVE-2026-54998-expExploit
CVE-2026-54998 RCE Exploit

Responsible use

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