CVE-2020-1173 Microsoft Power BI Report Server Spoofing Vulnerability

Medium 6.8 Published 21 May 2020 Updated 19 Aug 2026

An authenticated attacker can upload a crafted payload to execute scripts in the victim's security context due to improper content-type validation.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Over the internet
Victim action needed: A user has to click or open something
Fix: None listed

What is CVE-2020-1173?

CVE-2020-1173 is a medium-severity vulnerability in Microsoft Power BI Report Server, published on 21 May 2020. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

Official description

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.

Weakness: CWE-20

Which versions are affected by CVE-2020-1173?

It affects 1 product.

Products include Microsoft Power Bi Report Server.

How do I fix CVE-2020-1173?

No fix has been published for CVE-2020-1173 yet. Limit exposure of the affected software until one is available.

Is CVE-2020-1173 being exploited?

There is no known exploitation of CVE-2020-1173 in the wild and no public exploit code.

Sources

Also known as GHSA-42v9-rj5j-m2v5.