VulnerabilityALERT High

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

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.

Impact

CISA lists CVE-2026-42897 as known exploited in the wild for Microsoft Microsoft. Ransomware campaign use: Unknown. Federal remediation due date: 2026-05-29.

Recommended Action

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

Published: 5/15/2026, 12:00:00 AMSource: CISA Known Exploited Vulnerabilities CatalogTags: CVE-2026-42897, Microsoft, Microsoft, CISA KEV, CWE-79