What is CVE-2026-54998?

CVE-2026-54998 is a security advisory published by Microsoft Security Response Center (MSRC). 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.

CVE-2026-54998

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 →

📋 Description

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

🔗 References (1)

advisoryhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-54998