CVE-2026-55009CWE-502

Microsoft Exchange Server Elevation of Privilege Vulnerability

High · published July 14, 2026

CVSS v3.1
7.8
EPSS
3%
Percentile
84.7
In the wild
Unconfirmed
What it is

Deserialization of untrusted data in Microsoft Exchange Server allows an authorized attacker to elevate privileges locally.

The record
Technical detail
CVSS v3.1
7.8 · HIGH
Vector
CVSS:3.1/AV:L/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
0.02513 · 84.7th percentile
Weakness
CWE-502 · Deserialization of Untrusted Data
Published
2026-07-14T17:05Z
EPSS history
Timeline
  • 14 JUL 17:05Z
    Microsoft Exchange Server Elevation of Privilege Vulnerability
    cvelistv5