CVE-2026-21527CWE-1286CWE-345CWE-451

Microsoft Exchange Server Spoofing Vulnerability

Medium · published February 10, 2026

CVSS v3.1
6.5
EPSS
8%
Percentile
94.9
In the wild
Unconfirmed
What it is

User interface (ui) misrepresentation of critical information in Microsoft Exchange Server allows an unauthorized attacker to perform spoofing over a network.

The record
Technical detail
CVSS v3.1
6.5 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C
CVSS v4.0
Not supplied
EPSS
0.08256 · 94.9th percentile
Weaknesses
CWE-1286 · Improper Validation of Syntactic Correctness of Input; CWE-345 · Insufficient Verification of Data Authenticity; CWE-451 · User Interface (UI) Misrepresentation of Critical Information
Published
2026-02-10T17:51Z
EPSS history
Timeline
  • 10 FEB 17:51Z
    Microsoft Exchange Server Spoofing Vulnerability
    cvelistv5