CVE-2026-42897
Microsoft Exchange Server Cross-Site Scripting Vulnerability
Summary
Microsoft Exchange Server contains a cross-site scripting vulnerability during web page generation in Outlook Web Access and when certain interaction conditions are met, arbitrary JavaScript can be executed in the browser context.
Affected software
Vendor: Microsoft · Product: Microsoft
Weakness types (CWE):
What to do
This vulnerability appears in CISA's Known Exploited Vulnerabilities catalog, meaning it is being exploited in the wild. Prioritize patching affected systems and verify exposure across your estate.
Related vulnerabilities in Microsoft
| CVE | Name | EPSS | Exploited |
|---|---|---|---|
| CVE-2025-53770 | Microsoft SharePoint Deserialization of Untrusted Data Vulnerability | 100.0% | Yes |
| CVE-2021-34473 | Microsoft Exchange Server Remote Code Execution Vulnerability | 100.0% | Yes |
| CVE-2019-0708 | Microsoft Remote Desktop Services Remote Code Execution Vulnerability | 100.0% | Yes |
| CVE-2015-1635 | Microsoft HTTP.sys Remote Code Execution Vulnerability | 100.0% | Yes |
| CVE-2021-26855 | Microsoft Exchange Server Remote Code Execution Vulnerability | 100.0% | Yes |
| CVE-2025-49704 | Microsoft SharePoint Code Injection Vulnerability | 100.0% | Yes |
| CVE-2021-34523 | Microsoft Exchange Server Privilege Escalation Vulnerability | 100.0% | Yes |
| CVE-2023-29357 | Microsoft SharePoint Server Privilege Escalation Vulnerability | 100.0% | Yes |
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Get your free reportSources: CISA KEV catalog · NVD · FIRST EPSS
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