Local Privilege Escalation in Microsoft Exchange Server
CVE-2025-53782

8.4HIGH

Key Information:

Vendor

Microsoft
Status
Microsoft Exchange Server 2019 Cumulative Update 15
Microsoft Exchange Server 2019 Cumulative Update 14
Microsoft Exchange Server Subscription Edition Rtm
Microsoft Exchange Server 2016 Cumulative Update 23
Vendor
CVE Published:
14 October 2025

What is CVE-2025-53782?

An authentication algorithm in Microsoft Exchange Server is incorrectly implemented, allowing unauthorized attackers to escalate their privileges locally. This vulnerability poses significant security risks as it may enable attackers to gain unauthorized access to sensitive data and resources within the server environment.

Affected Version(s)

Microsoft Exchange Server 2016 Cumulative Update 23 x64-based Systems 15.01.0.0 < 15.01.2507.061

Microsoft Exchange Server 2019 Cumulative Update 14 x64-based Systems 15.02.0.0 < 15.02.1544.036

Microsoft Exchange Server 2019 Cumulative Update 15 x64-based Systems 15.02.0.0 < 15.02.1748.039

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE...
vendor-advisory

CVSS V3.1

Score:
8.4
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Local
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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