What is CVE-2026-54998?

CVE-2026-54998 is a security advisory published by Microsoft Security Response Center (MSRC) with Critical severity. Microsoft Exchange Online Elevation of Privilege Vulnerability

Which CVE IDs does CVE-2026-54998 cover?

CVE-2026-54998 covers the following CVE IDs: CVE-2026-54998. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of CVE-2026-54998?

CVE-2026-54998 has a CVSS v3 base score of 8.8, published by Microsoft Security Response Center (MSRC).

CVE-2026-54998CriticalCVSS 8.8

Microsoft Exchange Online Elevation of Privilege Vulnerability

Vendor

Microsoft Security Response Center (MSRC)

Published

July 7, 2026

Last Modified

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🔗 CVE IDs covered (1)

CVE-2026-54998 →

🔗 CVE IDs covered (1)

📋 Description