CVE-2025-59249 HIGH

CVE-2025-59249: Microsoft Exchange Server Elevation of Privilege Vulnerability

Vendor Microsoft
Product Microsoft Exchange Server 2016 Cumulative Update 23
Weakness CWE-1390
Published October 14, 2025
Last update February 26, 2026
View on NVD All CVEs

CVSS base score

8.8/10
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction None
Confidentiality High
Integrity High

CVSS 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

What the vulnerability does

01Description

Weak authentication in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.

Key dates

02Disclosure timeline

October 14, 2025 CVE published
February 26, 2026 Record updated