XSS in Microsoft Power Bi Report Server
CVE-2021-41372
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.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.6 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:N.
EPSS exploit prediction
EPSS: 0.007 (50.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 50th percentile — 50.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.006 · newest: 0.007 · change: +0.000
Affected products
- Microsoft Power Bi Report Server — versions 15.0.1107.165
- Microsoft Power Bi Report Server Version 1.11.8091.10468 — versions 1.0.0.0
- Microsoft Power Bi Report Server Version 1.12.7977.29537 — versions 1.0.0.0
Weakness classification (CWE)
References
- af854a3a-2127-422b-91ae-364da2661108 (Patch, Vendor Advisory)
- msrc.microsoft.com/update-guide/vulnerability/CVE-2021-41372 (vendor-advisory, patch)
Frequently asked questions
- What is CVE-2021-41372?
- CVE-2021-41372 is a high-severity vulnerability in Microsoft Power Bi Report Server, classified under Cross-site Scripting. CVSS score: 7.6/10. Published 2021-11-10.
- How severe is CVE-2021-41372?
- High severity. CVSS v3 base score is 7.6 out of 10.