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Home - Vulnerability NotesPrint
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CERT-In Vulnerability Note CIVN-2026-0241
Spoofing Vulnerability in Microsoft Exchange Server

Original Issue Date:May 18, 2026

Severity Rating: CRITICAL

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 which could allow an unauthorized remote attacker to perform spoofing attacks on the targeted system.

Target Audience:
All end-user organizations and individuals using the Microsoft Exchange Server.

Risk Assessment:
Spoofing attacks, Information disclosure.

Impact Assessment:
Session hijacking, sensitive data exposure.

Description

This vulnerability exists in Microsoft Exchange Server due to improper neutralization of input during web page generation (¿Cross-site Scripting¿). An attacker could exploit this vulnerability by sending a specially-crafted request.

Successful exploitation of this vulnerability could allow an unauthorized remote attacker to perform spoofing attacks on the targeted system.

Solution

Apply appropriate security updates as mentioned:
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42897

Vendor Information

Microsoft
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42897

References

Microsoft
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42897

CVE Name
CVE-2026-42897

Disclaimer

The information provided herein is on "as is" basis, without warranty of any kind.

Contact Information

Email: info@cert-in.org.in
Phone: +91-11-22902657

Postal address

Indian Computer Emergency Response Team (CERT-In)
Ministry of Electronics and Information Technology
Government of India
Electronics Niketan
6, CGO Complex, Lodhi Road,
New Delhi - 110 003
India

 
Indian Computer Emergency Response Team - CERT-In, Ministry of Electronics and Information Technology, Government of India.
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