Cross-Site Scripting Vulnerability in Microsoft Exchange Server
CVE-2026-42897

8.1HIGH

Key Information:

Vendor

Microsoft
Status
Microsoft Exchange Server 2016 Cumulative Update 23
Microsoft Exchange Server 2019 Cumulative Update 14
Microsoft Exchange Server 2019 Cumulative Update 15
Microsoft Exchange Server Subscription Edition Rtm
Vendor
CVE Published:
14 May 2026

What is CVE-2026-42897?

An XSS vulnerability exists in Microsoft Exchange Server due to improper input neutralization during web page generation. This flaw can be exploited by attackers to perform spoofing attacks, potentially leading to unauthorized access or malicious actions over a network. It is essential for users to apply the necessary patches and follow security best practices to mitigate the risks associated with this vulnerability.

Affected Version(s)

Microsoft Exchange Server 2016 Cumulative Update 23 x64-based Systems -

Microsoft Exchange Server 2019 Cumulative Update 14 x64-based Systems -

Microsoft Exchange Server 2019 Cumulative Update 15 x64-based Systems -

References

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

CVSS V3.1

Score:
8.1
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
Required
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.