CVE-2025-64666

Improper input validation in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.

Score

CVSS 3.1 7.5 High

Status

Analyzed - secure@microsoft.com

Published

2025-12-09

Last modified

2026-10-14

Weaknesses

CWE-20

Affected products

• Exchange Server (Microsoft)
• Exchange Server 2016 (Microsoft)
• Exchange Server 2019 (Microsoft)
• Exchange Server Se (Microsoft)
• Exchange Server Subscription Edition (Microsoft)

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-64666