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CVE-2026-42897: Microsoft Exchange Server Cross-Site Scripting Vulnerability
Microsoft Microsoft · in CISA KEV since 2026-05-15
2026-05-15added to KEV
2026-05-29federal remediation due date
71.77%EPSS exploit probability (30 days) 99.4th percentile
6.1 MEDIUMCVSS 3.1
Unknownknown ransomware use
1days from NVD publication to KEV
What it is
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 (CISA)
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
| CWE | CWE-79 |
|---|---|
| CVSS vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N |
| NVD published | 2026-05-14 (Analyzed) |
Original records: NVD · CISA KEV · JSON: /api/cve/CVE-2026-42897.json · all KEV CVEs
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Get the full file: Exploited Vulnerabilities Brief – September 2026 ($29): this month's KEV additions ranked by EPSS, ransomware use and due date, ready to hand to a patch team. Checkout by Polar.
Get the full file: Exploited Vulnerabilities Brief – September 2026 ($29): this month's KEV additions ranked by EPSS, ransomware use and due date, ready to hand to a patch team. Checkout by Polar.