What’s Vulnerable › Vulnerabilities

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

• Severity: medium (CVSS 6.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2020-05-21 · updated 2026-08-19
• Weakness: CWE-20

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.

Affected products

• Microsoft Power BI Report Server: all versions
• Microsoft Power BI Report Server: from 1.6.0 before 1.6.7364.4075 — fixed in 1.6.7364.4075

How to fix

Upgrade to a fixed version: Microsoft Power BI Report Server 1.6.7364.4075. Check the vendor advisory for mitigations.

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2020-1173
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1173

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