CVE-2026-42897
MI
Microsoft Microsoft
Microsoft Exchange Server Cross-Site Scripting Vulnerability
What it is
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.
What to do
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Vendor notices and references
- msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2026-42897
- learn.microsoft.com/en-us/exchange/plan-and-deploy/post-installation-tasks/security-best-p
- nvd.nist.gov/vuln/detail/CVE-2026-42897
Description and required action as published by CISA. Full record at NVD.
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