Microsoft Exchange Server Cross-Site Scripting Vulnerability

Public source report. This item is not matched to your stack and does not establish whether you are affected.

• NewsExploited · CISA KEVMicrosoft · Microsoft

  Microsoft Exchange Server Cross-Site Scripting Vulnerability

  CVE-2026-42897

  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.

  CISA's required action · due 29 May 2026 for U.S. federal civilian agencies

  Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

  Cited by CISA: msrc.microsoft.com · learn.microsoft.com · nvd.nist.gov

  Added to KEV 15 May 2026 · Source checked 4 Nov 2026, 16:35 UTC · CISA KEV entry

  Loading voting…