.NET Denial of Service Vulnerability
CVE-2026-120796
Summary
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.
Products covered
Power BI Report Server version 1.11.8091.10468
Power BI Report Server version 1.12.7977.29537
Remediation
Install KB5007903.
Vendor-listed fixes
1.11.8091.10468
1.12.7977.29537
CVEs in this advisory 1
Updates
- Published by Microsoft Security Response Center
The publication date reported by the vendor.
- Updated by Microsoft Security Response Center
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- Added to SecurityAlert
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- Confirmed at the source
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