CVE-2026-54998 — Microsoft Exchange Online Elevation of Privilege Vulnerability

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

Published: 2026-07-02 · CVSS: 8.8 · CVSS 3.1

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

Original CVE JSON · STIX 2.1

Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7