Summary
| Parameter | Value |
|---|---|
| CVE ID | CVE-2026-42897 |
| Alert Source | CISA KEV - Active Exploitation |
| CVE Publication Year | 2026 |
| Date Published | 2026-05-15 |
| Vendor | Microsoft |
| Product | Microsoft |
| CVSS Score | 8.1 (high) |
| EPSS Score | 0.2% (percentile: 45%) |
| CISA KEV | Yes - confirmed active exploitation |
| Ransomware | Not confirmed |
| Remediation Deadline | 2026-05-29 |
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 Actions
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Who Is Affected?
This vulnerability affects Microsoft by Microsoft. Check if your organization uses this software and requires updates.
Sources
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