Security Updates for Microsoft Exchange Server (December 2025)

Version 1.3

Feb 25, 2026, 9:03 AM

CVSS metrics ("CVSSv2 score" set to 7.1)
CVSS metrics ("CVSSv2 vector" set to "CVSS2#AV:N/AC:H/Au:S/C:C/I:C/A:C")
CVSSv2 score source (changed from "CVE-2025-64667" to "CVE-2025-64666")
CVSSv2 severity (based on CVE-2025-64666, severity increased from "Medium" to "High")
CVSSv3 score source (changed from "CVE-2025-64666" to none)