CVE-2026-54998CWE-863

Microsoft Exchange Online Elevation of Privilege Vulnerability

High · published July 2, 2026

CVSS v3.1
8.8
EPSS
1%
Percentile
55.4
In the wild
Unconfirmed
What it is

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

The record
Technical detail
CVSS v3.1
8.8 · HIGH
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
CVSS v4.0
Not supplied
EPSS
0.00778 · 55.4th percentile
Weakness
CWE-863 · Incorrect Authorization
Published
2026-07-02T22:18Z
EPSS history
Timeline
  • 02 JUL 22:18Z
    Microsoft Exchange Online Elevation of Privilege Vulnerability
    cvelistv5