CVE-2026-55008CWE-79

Microsoft Exchange Server Spoofing Vulnerability

Critical · published July 14, 2026

CVSS v3.1
9.6
EPSS
1%
Percentile
58.2
In the wild
Unconfirmed
What it is

Improper neutralization of input during web page generation ('cross-site scripting') in Microsoft Exchange Server allows an unauthorized attacker to perform spoofing over a network.

The record
Technical detail
CVSS v3.1
9.6 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C
CVSS v4.0
Not supplied
EPSS
0.00863 · 58.2th percentile
Weakness
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Published
2026-07-14T17:04Z
EPSS history
Timeline
  • 14 JUL 17:04Z
    Microsoft Exchange Server Spoofing Vulnerability
    cvelistv5