CVE-2020-0903: Microsoft Exchange Server

Medium severity, CVSS 5.4. EPSS: 1.6% chance of exploitation in the next 30 days.

A cross-site-scripting (XSS) vulnerability exists when Microsoft Exchange Server does not properly sanitize a specially crafted web request to an affected Exchange server, aka 'Microsoft Exchange Server Spoofing Vulnerability'.

Affected products

• Microsoft Exchange Server: version 2016 only; version 2019 only

Published 2020-03-12. Last modified 2026-06-17.