What is CVE-2023-21806?

CVE-2023-21806 is a high-severity vulnerability in Microsoft Power Bi Report Server, classified under Cross-site Scripting. CVSS score: 8.2/10. Published 2023-02-14.

How severe is CVE-2023-21806?

High severity. CVSS v3 base score is 8.2 out of 10.

XSS in Microsoft Power Bi Report Server

CVE-2023-21806

Power BI Report Server Spoofing Vulnerability

Vulnerability class: XSS (Cross-Site Scripting)

Published 2023-02-14 · last modified 2026-08-19.

CVSS v3 metric

CVSS v3 base score 8.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:L.

EPSS exploit prediction

EPSS: 0.008 (54.0th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 54th percentile — 54.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: 0.000

Affected products

Microsoft Power Bi Report Server
Microsoft Power Bi Report Server - January 2023 — versions 15.0.0

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

msrc.microsoft.com/update-guide/vulnerability/CVE-2023-21806 (vendor-advisory, Patch, patch, Vendor Advisory)

Frequently asked questions

What is CVE-2023-21806?: CVE-2023-21806 is a high-severity vulnerability in Microsoft Power Bi Report Server, classified under Cross-site Scripting. CVSS score: 8.2/10. Published 2023-02-14.
How severe is CVE-2023-21806?: High severity. CVSS v3 base score is 8.2 out of 10.