CVE-2026-54998

Microsoft Exchange Online Elevation of Privilege Vulnerability

Published Jul 2, 2026 CVSS 3.1 · 8.8 High EPSS < 1% KEV · Not listed
Description
Incorrect authorization in Microsoft Exchange Online allows an authorized attacker to elevate privileges over a network.

Remediation

No solution or workaround provided in the CVE record

Tracking

Sign in to view the affected projects.

Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description Incorrect authorization in Microsoft Exchange Online allows an authorized attacker to elevate privileges over a network.
Title Microsoft Exchange Online Elevation of Privilege Vulnerability
First Time appeared Microsoft
Microsoft exchange Online
Weaknesses CWE-863
CPEs cpe:2.3:a:microsoft:exchange_online:*:*:*:*:*:*:*:*
Vendors & Products Microsoft
Microsoft exchange Online
References
Metrics cvssV3_1

{'score': 8.8, 'vector': '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'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
microsoft
Published
Updated
Nov 10, 2026, 10:34 PM
Reserved
Jun 16, 2026, 2:10 PM
Status
Analyzed
Published
Jul 2, 2026, 11:16 PM
Modified
Oct 25, 2026, 9:10 PM