high
CISA KEV
CVE-2026-42897
Microsoft Exchange Server Cross-Site Scripting Vulnerability
// Description
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.
// Required 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.
Federal remediation due May 29, 2026 — past due
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// Coverage
- CVE-2026-42897: Microsoft Exchange OWA XSS Zero-Day Under Attack
May 19, 2026
- CVE-2026-42897: Microsoft Exchange XSS Under Active Exploitation
May 15, 2026
- CVE-2026-42897: Microsoft Exchange Server Zero-Day Exploited in Wild
May 15, 2026
- CVE-2026-42897: How Attackers Exploit Microsoft Exchange Server
May 15, 2026