CVE-2020-1173: Microsoft Power BI Report Server

Medium severity, CVSS 6.8. EPSS: 2.5% chance of exploitation in the next 30 days.

A spoofing vulnerability exists in Microsoft Power BI Report Server in the way it validates the content-type of uploaded attachments. An authenticated attacker could exploit the vulnerability by uploading a specially crafted payload and sending it to the user. The attacker who successfully exploited this vulnerability could then perform actions and run scripts in the security context of the user. This security update addresses the vulnerability by ensuring Power BI Report Server properly validates content-type of the attachments when uploading and opening.

Affected products

• Microsoft Power BI Report Server: affected versions not specified

Published 2020-05-21. Last modified 2026-08-19.