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CVE-2026-42897CISA KEV

Microsoft Exchange Server Cross-Site Scripting Vulnerability

CISA lists this Microsoft vulnerability as known exploited. Its MSRC release detail is outside this installation's collected history.

CISA KEV Check MSRC

CISA catalog record

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.

Product
Microsoft
Added to KEV
15 May 2026
Federal remediation due
29 May 2026
Known ransomware use
Not reported
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