CVE-2026-45583 HIGH

CVE-2026-45583: Microsoft Exchange Server Remote Code Execution Vulnerability

Vendor Microsoft
Product Microsoft Exchange Server 2016 Cumulative Update 23
Weakness CWE-94 · Code injection
Published June 9, 2026
Last update June 15, 2026
View on NVD All CVEs

CVSS base score

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

CVSS vector

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

What the vulnerability does

01Description

Improper control of generation of code ('code injection') in Microsoft Exchange Server allows an unauthorized attacker to execute code over a network.

Key dates

02Disclosure timeline

June 9, 2026 CVE published
June 15, 2026 Record updated