CVE-2025-59248 HIGH

CVE-2025-59248: Microsoft Exchange Server Spoofing Vulnerability

Vendor Microsoft
Product Microsoft Exchange Server 2016 Cumulative Update 23
Weakness CWE-20 · Input validation
Published October 14, 2025
Last update February 22, 2026
View on NVD All CVEs

CVSS base score

7.5/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality High
Integrity None

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C

What the vulnerability does

01Description

Improper input validation in Microsoft Exchange Server allows an unauthorized attacker to perform spoofing over a network.

Key dates

02Disclosure timeline

October 14, 2025 CVE published
February 22, 2026 Record updated