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