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CVE-2021-41372: Power BI Report Server Spoofing Vulnerability

• Severity: medium (CVSS 6.8 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-11-10 · updated 2026-08-19
• Weakness: CWE-79

Description

A Cross-Site Scripting (XSS) and Cross-Site Request Forgery (CSRF) vulnerability exists when Power BI Report Server Template file (pbix) containing HTML files is uploaded to the server and HTML files are accessed directly by the victim. Combining these 2 vulnerabilities together, an attacker is able to upload malicious Power BI templates files to the server using the victim's session and run scripts in the security context of the user and perform privilege escalation in case the victim has admin privileges when the victim access one of the HTML files present in the malicious Power BI template uploaded. The security update addresses the vulnerability by helping to ensure that Power BI Report Server properly sanitize file uploads.

Affected products

• Microsoft Power BI Report Server: 15.0.1107.165
• Microsoft Power BI Report Server version 1.11.8091.10468: from 1.0.0.0 before 1.11.8091.10468 — fixed in 1.11.8091.10468
• Microsoft Power BI Report Server version 1.12.7977.29537: from 1.0.0.0 before 1.12.7977.29537 — fixed in 1.12.7977.29537

How to fix

Upgrade to a fixed version: Microsoft Power BI Report Server version 1.11.8091.10468 1.11.8091.10468; Microsoft Power BI Report Server version 1.12.7977.29537 1.12.7977.29537. Check the vendor advisory for mitigations.

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-41372
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-41372

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