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Unrated severityNVD Advisory· Published Dec 9, 2025· Updated Apr 16, 2026

Microsoft Exchange Server Elevation of Privilege Vulnerability

CVE-2025-64666

Description

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

Affected products

5
  • Microsoft/Exchange Serverllm-fuzzy
  • Microsoft/Microsoft Exchange Server 2016 Cumulative Update 23v5
    Range: 15.01.0.0
  • Microsoft/Microsoft Exchange Server 2019 Cumulative Update 14v5
    Range: 15.02.0.0
  • Microsoft/Microsoft Exchange Server 2019 Cumulative Update 15v5
    Range: 15.02.0.0
  • Microsoft/Microsoft Exchange Server Subscription Edition RTMv5
    Range: 15.02.0.0

Patches

0

No patches discovered yet.

Vulnerability mechanics

AI mechanics synthesis has not run for this CVE yet.

References

1

News mentions

0

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