CVE-2026-69378 HIGH

CVE-2026-69378: Microsoft Exchange Server Denial of Service Vulnerability

Vendor Microsoft
Product Microsoft Exchange Server 2016 Cumulative Update 23
Weakness CWE-674
Published September 8, 2026
Last update September 18, 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 None
Integrity None

CVSS vector

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

What the vulnerability does

01Description

Uncontrolled recursion in Microsoft Exchange Server allows an unauthorized attacker to deny service over a network.

Key dates

02Disclosure timeline

September 8, 2026 CVE published
September 18, 2026 Record updated