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Elevation of Privilege Vulnerability in Microsoft Exchange Server Hybrid Deployment 

Indian – Computer Emergency Response Team (https://www.cert-in.org.in)

Severity Rating: HIGH

Software Affected

Microsoft Exchange Server 2019 Cumulative Update 14

Microsoft Exchange Server 2016 Cumulative Update 23

Microsoft Exchange Server 2019 Cumulative Update 15

Microsoft Exchange Server Subscription Edition RTM

Overview

A vulnerability has been reported in Microsoft Exchange Server Hybrid Deployment which could allow an attacker to gain elevated privileges on the targeted system.

Target Audience:

All end-user organizations and individuals using the Microsoft Exchange Server Hybrid Deployment

Risk Assessment:

High risk of system compromise.

Impact Assessment:

Potential gaining unauthorized access to sensitive resources.

Description

This vulnerability exists in Microsoft Exchange Server Hybrid Deployment due to improper authentication. An attacker could exploit this vulnerability by sending a specially-crafted request to gain elevated privileges on the targeted system.

Successful exploitation of this vulnerability could allow an attacker to gain elevated privileges on the targeted system.

Solution

Apply appropriate upgrade as mention:

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-53786

Vendor Information

Microsoft

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-53786

References

Microsoft

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-53786

CVE Name

CVE-2025-53786

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Thanks and Regards,

CERT-In

Incident Response Help Desk

e-mail: incident@cert-in.org.in

Phone: +91-11-22902657

Toll Free Number: 1800-11-4949

Toll Free Fax : 1800-11-6969

Web: http://www.cert-in.org.in

PGP Fingerprint: A768 083E 4475 5725 B81A A379 2156 C0C0 B620 D0B4

PGP Key information:

https://www.cert-in.org.in/s2cMainServlet?pageid=CONTACTUS

Postal address:

Indian Computer Emergency Response Team (CERT-In)

Ministry of Electronics and Information Technology

Government of India

Electronics Niketan

6, C.G.O. Complex

New Delhi-110 003

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